I show my work in both indoor and outdoor venues, both of which can be quite costly. The average cost for a 10x10 space at an outdoor show is $150-250. If you'll need to stay overnight, add at least $100 to that. Meals? Be frugal and pack some of it. Then there's gas and incidentals. I have paid off almost all of my credit cards so I don't have the luxury of charging these fees. I used to do that; I would advise you not to if you can avoid it.
So how does an artist deal with the upcoming costs for the shows they plan to enter throughout the upcoming season? Here are a few tips:
Start looking for shows that fit your style and pocketbook in January. Some may not be listed yet, so keep checking every week or two. Send your application as soon as you can to get the best display spots.
Check out Art Fair Calendar for shows in your area/region. They list shows by date and by area. You can also search google for shows using keywords.
When you have decided on the shows you be in, add up the show fees. To that number, add $50 per show for meals, etc. (Not every show will require lodging, etc.) Divide that total by the number of shows. This is the amount you must put into savings per month until show #1.
You'll also most likely have framing costs. I recommend ordering frames online from Dick Blick, Jerry's Artarma, or similar companies. Doing the work yourself is quite easy; you can find instructions on Youtube. This will save you a ton of money!