Well since I'm kind of 'forbidden' to go to fish stores by my parents, I would like to know the prices of the standard tank sizes that most store carries (Petco, Petsmart, etc). I know that the 10 gallon standard is $10, the 5.5 is about $12, and the 2.5 with dividers are $15. My question is, how much does the other tank sizes (20 gallon, 29 gallon, etc) cost? I've never paid attention to them but right now I may need another tank due to my cherry shrimp population explosion. Anyone would like to help me out here?