Orders placed BEFORE the following times are shipped on the SAME day. Shipping via Express-Mail (next day delivery) is $16.50 flat rate to all 50 states in the U.S. Shipping via First-Class (2-3 day delivery) is $3.95 flat rate to all 50 states in the U.S. When you are done using the calculator, simply return it. What happens when I'm done using the calculator?
![amazon ti 84 online amazon ti 84 online](https://m.media-amazon.com/images/I/71eVF7MvBqL._AC_SY606_.jpg)
Calculators are rented on a "month to month" basis, there are no late fees, and you conveniently pay-as-you-go.ģ. You may keep the calculator for as long or as little as you wish. Renting a calculator takes about 2-3 minutes, on-line or over the phone.Ģ. See the current prices on Amazon for the TI-89 Titanium, HP Prime, Casio Prizm, or read my reviews of the 89, Prime, or Prizm.Yes. And much like the TI-84 CE, the TI-89 Titanium performs much like a tech stock IPO, with significant hour by hour variability. One could have saved $16 by purchasing the Prizm at the right time ($101 vs $85 at the low). The Prime had a very stable price, spending most of the month at $99. Here is a comparison of 3 other arguably lesser known, but in my opinion, excellent models, the TI-89 Titanium, Casio Prizm, and HP Prime. See the current Amazon prices on the TI-Nspire CX, TI-Nspire CX CAS, or read my TI-Nspire CX review. Even here, though, we see not only minor variation in price, but a week long drop in price for the TI-Nspire CX of almost $20, behavior more like one would expect to see with a brick and mortar store putting an item on a temporary sale. Here the prices were more stable, possibly due to the fact that there have been no new Npsire models for a couple of years. I gathered data for the two current TI-Nspire models, the TI-Nspire CX, and the TI-Nspire CX CAS.
#AMAZON TI 84 ONLINE PLUS#
See the current Amazon prices on the TI-84 Plus CE, TI-84 Plus C, TI-84 Plus, or read my TI-84 Plus CE review. Unfortunate buyers paid $135 at the beginning of the month.
![amazon ti 84 online amazon ti 84 online](https://m.media-amazon.com/images/I/51pihJl0RDL._CR1,0,638,360_SR342,193__BG0,0,0__QL65_.jpg)
As you can see the TI-84 Plus CE price varies wildly, sometimes careening up and down by nearly $40 in an hour. This was easily the most interesting grouping I have data for. While there are many TI-84 Plus models available, I focused on 3: the classic TI-84 Plus black, last year’s TI-84 C, and the all new for 2015-16 TI-84 Plus CE. Since this calculator has 80 3rd party sellers all competing for sales, you may see a 3rd party seller who is dramatically undercutting Amazon just so they can claim the buy box.Īs you read through the graphs that follow, keep in mind that if you’d like to take advantage of this interesting pricing phenomenon, you can do so by following my Twitter feed. I’m working towards setting up my Twitter feed to Tweet when there are significant price drops on graphing calculators on Amazon (if I succeed, I’ll limit the number of daily and weekly tweets to a small number I send so I don’t spam tweet everyone).Ĭlicking on any of these graphs will launch a much larger version in a new window that you may find easier to read, depending on your screen size, whether you are viewing this post on a mobile device, etc. Prior to July, they had maintained a relatively stable price on that calculator. In the case of the TI-84 Plus CE, the wild fluctuations were a result of Amazon dramatically dropping the price below $90 in July. Since it is virtually impossible to sell an item on Amazon without the buy box, you will sometimes see deep discounting from 3rd party sellers to try to claim the buy box from Amazon so that they can move product. I spoke with my cousin Alex Upperman, who makes his living selling products online, about why there might be such great price variability on some of these models.
![amazon ti 84 online amazon ti 84 online](https://m.media-amazon.com/images/I/81hg-yJwfwL._AC_SY550_.jpg)
and your friend bought at 4 p.m., you might have paid as much as 30% more (or less, of course). It’s possible that if you bought a calculator on a Tuesday a 3 p.m.
![amazon ti 84 online amazon ti 84 online](https://m.media-amazon.com/images/I/41MeE9chIcL._AC_SY1000_.jpg)
Not only do graphing calculator prices for Texas Instruments, Casio, and HP fluctuate, in some cases they do so on dramatic scales and on an hour by hour basis. The results are now in, and they are more surprising than I could have imagined. Every hour for an entire month, I’d collect the Amazon price for these graphing calculators to see how they change over the month to confirm or refute my suspicions. Then about a month ago, I decided to conduct a little experiment using some of my favorite graphing calculator models. I wasn’t sure if what I thought was true was really true. Until recently, this was just anecdotal for me. Check again a week later, and it’s different still. There have been times I’ve visited Amazon for a specific product, noted the price, and when I checked back in two days later, the price had changed significantly. If you’re like me, you’ve noticed that prices on Amazon seem less stable than those in brick and mortar stores.