You will appeal more to the 'pretty picture' buying group if you keep your pricing in the $40 to $80 range. When you get into the $150 to $250 range you start reducing your buying group and when you get into the $300 to $500 range you have to appeal to the 'casual' fine art photography buyer. The 'serious' fine art photography buyer is in the $700 to $1,000 range. Over $1,000 the buyer is going to probably want you to have some 'street cred'. I'm kinda' pulling these numbers out of my ass but they are fairly accurate.
The OP and I were both talking about matted and framed photos. Generally speaking, the mats and frames are heavily marked-up items. There is a saying in the art world that a buyer will happily pay $250 for a frame, but then balk at paying $25 for the artwork to put in it. I generally sell unmounted prints for relatively-low prices, matted prints for quite a bit more, and matted and framed prints for a lot. This seems to be general practice among photographers I know.
How much you can expect to charge also depends on the venue. I've learned to stay away from "arts and crafts" fairs, for example, because the people who attend those are generally only interested in staring at the "pretty pictures" and
maybe buying a photo greeting card for a few bucks, leaving me with maybe a dollar profit on the sale. I understand that you can charge and make a lot more at bigger-name juried art shows, which attract a more upscale level of customers, but require a pretty large upfront investment, which I haven't felt like doing yet.