How much does a sugar glider cost?

I really want to get 2 sugar gliders at the October 22-23, 2011 Repticon Reptile Show in Orlando, FL. I'm going to save up my money so I have enough, but I'm not sure. Also, do you think a cage 50 inches tall and 25 inches wide and 25 inches long is big enough for 2 because I read for 1 the ideal space is 36x18x18 inches. please help(: