The 1" rule per gallon is totall crap. I mean think about it would you put a 10" Oscar in a 10 gallon tank? Or a couple 10 feet long sharks in a 250 gallon? Its a stupid rule fish stores came up with to sell more fish!
Ohh never mind just noticed you said not included sorry... I would think 100 bucks is kinda steep for just a tank and hood IMO. Used tanks your lucky if u get 1/2 of what u paid for them I'd say most might average 1/4 of what they invested.