The consumer CRT market on Facebook Marketplace has entirely dried up. 3, 4 years ago, you could get a flat-screen Trinitron, decent Panasonic, or even the occasional JVC D-Series for less than 50 dollars. Now? You're lucky if you can find anything for double digits that has more than composite and RF. If you don't have an old CRT yet, you're shit of out of luck now.