I'm pretty sure the one on the left is a Main. The one on the right is a Keene, K-25 or K-50 (25 cent piece or 50 cent piece maximum size, should be able to determine by looking at the round plate the coins go through at the top. Keene was a successor to Johnson, and later became General Farebox - GFI. Not sure, bus suspect the one in the middle is a Cleveland.
Fareboxes turn up on Ebay for price comparison. My Johnson D Box, restored in very good condition was around $400 when I bought it many years ago, probably $500 today. I have a Diamond (cylindrical) drop box, which Diamond dated to the late 1940's (showed them a picture at an APTA Conference). Less collectible than the classic Johnson, my guess would be around $100 today.
Likewise, the Diamond is a repository for change when I'm in a hurry. When not, change is sorted into my old changer from when I was a driver -- more convenient to roll from there.
Arthur