I have a 4 gallon flatback hex tank with hood/light and UG filter. The light fixture is rated for a 15w incandescent bulb, but one of the new low-profile CF bulbs would work nicely for a planted setup.
Overloaded with endler's and BN pleco's, PM if you want some shipped.
Are you looking to buy used, or do you have a question? I have two of the PetCo Bookshelf tanks that house my bettas. I quite like them (even though one of the started to leak, which appears to be common judging by the reviews). I'm upgrading all of mine to 20L.