At the most recent 3 day fair I sold 18 framed pieces ranging from a few 15 x 42's through mostly around 21 x 55 up through five 30 x 72's. No small pieces at all. And no prints. All were framed, coated canvases mounted on Gatorfoam without glass or plex. Prices from $350 for the 15 x 42's through $900 for the 30 x 72's. Plus I took orders for six mural size pieces from two different decoraters, and a few custom orders from individuals. Total take attributable to the fair was close to $20K. Which is the best I have ever done at a fair. Plus I got a contact with the director of the local art museum, plus I got a personal invite to a hard-to-crack art show, plus I got a good hotel buyer contact which is my bread & butter business. You can accumulate a lot of important contacts at fair, some vendors claim to go for no other reason. Plus I had a great time chatting with the guys in the booth across the aisle. There were nine other photographers at the same fair selling 8 x 10 through 20 x 24 pretty pictures mostly in aluminum suicide frames, they did not do well at all.
My framing and fabrication are all carefully cost engineered. That includes buying a season's worth of materials all at once. 1900 feet of moulding (about 100-120 largish frames), all in a single shipment from a not-too-distant supplier, and a couple boxes of Gator, glue and coating by the 4 gallon box, etc. Cost savings were huge on the moulding and pretty good on the other stuff. Never buy moulding by the stick or length or the chop, stick to boxes. I have efficient but not super framing equipment and can produce around 5 large pieces a day when I feel so inclined. That capacity gives me a big advantage over most other art fair mavens. Wish I could also get big discounts on canvas & ink, but frankly moulding is the heavyweight on the spreadsheet, way ahead of media. Total cost to produce finished pieces is always less than 1/6 selling price, that's the pricing rule. Only one type of moulding, and that was selected partly for looks and partly for the fact that it tends to be very easy to work with...no Mouldings-From-Hell here, thank you, and believe me there are such mouldings and you do not want to deal with a couple hundred intractable sticks of them. This season's moulding was also selected to have a gold lip, which eliminates the aesthetic need for a liner which right there saves a bundle of money & work.
BTW forget the merely pretty pictures of faraway places. What you want is photos that glorify landscapes, architecture and places familiar to your potential buyers. Shot at magic hour, with great clouds, beautiful light etc. Nothing sells better and people who never bought a piece of art in their lives will buy that sort of stuff. Especially if it's presented in clearly classic framing. Especially if it's BIG and of Perceived High Value. PHV is what it all comes down to, and framed canvas just oozes PHV. A customer's city skyline or his area's dominant landmark features presented in large scale classic glory will outsell Aluminum Antelope Canyon 10:1, no matter how many shafts of dusty light there are. And while this all seems a little flippant and money-grubbing, you can have a fine time making some really great photos that satisfy all the requirements and fairs can be fun and if not you at least get a lot of exercise.