Could I buy a Tetra aquarium cube tank for my betta fish?

I had a 1 gal bowl with no heater or filter and I'm looking for a CHEAP upgrade. It's at walmart. http://mobile.walmart.com/m/?wicket:bookmarkablePage=:com.wm.mobile.web.item.SearchItemLookup&zip=63135&product_id=10291810&search_query=Fish+tanks&id1_hf_0=&y=20&x=56 also if it's so bad to put a betta in a tank less than 3 gallons then y do the stores sell them expesially for the betta?