Warahgirl: The first link I posted (On page 1) Is a link to intstructions on how to build a bin cage, and the second one is just people's own bin cages as examples on what can be done with them (Tubes, connected cages, etc...Not ones for sale )

Pretty much what you would need to build a bin cage is wire too small for hammy to get through (home depot) a bin (Wal-mart), electrical ties and a drill. It is more effort than buying a cage but cheaper (Providing you can borrow a drill from someone :P )