I recommend:
http://www.queencitypets.com/
They have good quality cages at lower prices then you'll find anywhere else.
However, I would prefer to see the cage in person before buying. But petshops can be so expensive...
If you go to that site, try to avoid the cages that open at the top. These can be dangerous for a curious birdy.
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Ducki; Pineapple GCC
Pickles; Lineolated Parakeet; deceased 6/2/08
Ryoki; Staffshire Terrior
Bowser; Mini Turtle
Phish & Snowball 2: The fish