The site is: http://www.tomaquarium.com
If you click on the left bar 'Products', you can see quite a few items listed that you can get for aquariums. The good thing about it is, it also list the sizes that the items come in and the gallons the tanks holds so you don't have to do any thinking on how many gallons it would hold, and you can find them in almost any major pet store.
Great little list to help plan out a shopping list for getting a betta or any small fish.
Please remember that Bettas should be housed in AT LEAST a 2 gallon tank. Any tank smaller requires frequent water changes.