Planted Tank Obsessed
Join Date: Dec 2010
Location: Fayetteville, AR
From what I have seen, tanks over 100 gallons usually sale from between $1/gallon and $1.50/gallon. Most people won't go under that, though you will find the occasional great deal. That isn't including all the extras, either.
I just sold a 125 with matching store bought stand (both in good condition) for $200. You have to remember, the larger the tank the more it costs. The bigger tanks go up by quite a bit, and can't ever be had new for 1$/gallon like the smaller ones. A new 125 with glass tops locally is around $300 and the store bought stand is around the same.