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I've personally used this 1 and this 2. I've below average size wise so 2 was entirely too big on me and I didn't like the band that goes around the balls - it caused too much chafing. 1 is what I'm using now and besides a small rough patch around one of the seams its very comfortable for normal wear.
If you just search chasity on amazon you will find a lot of other devices for less that $50. For your first device definitely get one that comes with 3 to 5 different ring sizes and for your cherry popping, I recommend, get one with an open ring like 1 or the silicon version of 1 since for me besides relaxing the hard thing about the first few times was getting the ball sac to stretch enough to go through the ring. Chasity, just like diapers, requires trying it three or four times before your privates can behave (trying to tie this back into the main thread).
That's the one I purchased.