I of course can empathize with the OP. They are at a somewhat unreasonable price. I have noticed them peak, if not come down in the last two years. I've just used it as an opportunity to get ahead of the curb and grab the PSX and N64 games I want before they skyrocket. Just being patient with the SNES for now and only getting games I know I will play soon.
To combat this, I have been getting the Genesis/Mega Drive versions of games when possible. Contrary to SNES, it is hard to find a game for more than $20, at least in my neck of the woods. They are not what I am nostalgic for, but sometimes when I sit down with the games I realize that the genny versions are sometimes better than what I remember on the SNES (Earthworm Jim, for example).