The first "retro" CRT I got (as in, when they were considered retro and not just a cheap monitor for when you couldn't afford a flat-screen!) was this Relisys TE-555 15" monitor:
I then got this one for the princely sum of £1. It turns out it's got a problem with the menu though, where it randomly pops on the screen. I wired in a latching switch to the exit button to stop it from coming up, but clearly, a more substantial repair is needed...
Then, I got this one for absolutely gratis from a guy I work with at this computer repair place. It was from an old Sempron PC whose VRM capacitors had all blown on the motherboard, so I'm planning on fixing that up at some point.
Both of these are 17" models with a maximum resolution of 1280x1024, pretty standard stuff for the early to mid 2000s. I've also got this:
It's a Samsung Hitron, I think it's called. Anyway, it's a Trinitron clone from after Sony's patent on Trinitron technology expired. Here, I've got it with my old PS1 as well as an AV switch, which will allow me to plug in other consoles and devices to the TV and switch between them.