Gotcha. Well, I do think that big goldy tanks look awesome. Make sure to get some pictures to put up in the photography section once you are going!
For selling them, you can try CL
or trading them in at an lfs
for credit. Generally, chain stores won't give credit, they only take in fish as "adoptions." Though, if you have some that you don't think you can sell but need to re-home, that is still a good option.