Warning to calculator enjoyers!! Do not update Texas Instruments graphing calculators. You may get locked out of running third-party programs. If you have already been locked out, do some research -- some systems can still be jailbroken, but others are fully locked as far as I'm aware. New-in-store calculators are already affected by default, since they have the latest OS.
Warthog (TI-84+): Gift. She works perfectly, and is my go-to desktop calculator at the moment. She's a tidy little calc with extremely light signs of wear.
Beaver (TI-84+ CE): Gift. She's another one I've had since middle school. She's in perfect condition except for the fact that her on/off button doesn't work. I just use the reset button in the back instead. She has a custom slidecase with various graphs of functions, as well as six-inch and six-centimeter rulers. I mostly use her for the GB/GBC emulator she can run, which can be found here. She runs very smoothly, at what I assume to be full FPS.
Cobra (TI-84+): Gift, formerly a loaner. She's perfectly functional except for the B key, as well as a slightly-sticky-but-still-completely-usable Sin key. Not much to say about her!
Meerkat (TI-84+): My purchase. After Ermine got damaged, I went out and bought a brand new calculator. I had wanted to get an 83+ for the familiarity, but they didn't have one. She's in perfect condition, and is the graphing calculator I currently keep in my backpack.
Bluebell (TI-30Xa): My purchase. Bluebell is a scientific calculator. Because of this, I only use her when a professor specifically requests a scientific calculator as opposed to a graphing calculator. That being said, she's my newest calculator, and she's mostly functional, although the decimal point key is weirdly prone to Just Not Working.
Dandelion (Casio fx-260 Solar II): My purchase. Another scientific calculator. Backup I had to buy when I left my usual scientific calculator at home on a day when we had a quiz. Works fine, but the keys are a bit too small for me.
Stoat (TI-83+): Gift, bought on eBay. She doesn't handle like Ermine (the buttons press much easier, and she feels a lot lighter), which gives me a bit of an eerie feeling when using her. Some screen smudging. No longer working, cause of death unknown.
Ermine (TI-83+): Gift. My first and most-loved graphing calculator. Got water-damaged, but then I fixed her, but then she got thrown out by someone who thought she was still water-damaged. She had a big ugly splotch on the screen, and a row of dead pixels to boot, but she was my trusted calculator from middle school till my second year of college.