Nano cube or bio cube

Does it have to be new? If not I would check out craigslist or any local classified site. I found my 28 gallon nano cube for a steal of a deal, and then found the LED hood for sale from someone else for a great price as well. A little hunting around might prove to be worth it for you.
I got my NC HQI from Marine Depot. At the time I bought it, they had the best price for it plus free shipping.