I have a marineland six gallon mini-bow for sale. System has been up and running for a month or two. Comes with assortment of snails and hermits, one brittle star (~5" across), 3 or so pounds of live rock, 1/2 to 3/4 inch of sand,
macro algae, thermometer, 75gph pump, one T-5 daylight bulb, alot of pods, timer for the light, and a couple light scratches that could easily be buffed out if you are so inclined. The aquarium kit alone is ~$60 new at Petsmart. $60 takes everything (except the rock mentioned below).
Also have about 8# of
tonga branch that I have been cooking that would work nicely with the 6g or any other aquarium for that matter. $25