While I realize Petco is the evil empire when it comes to animal care, they do carry some nice supplies. We have the 18x18x30 flight cage. Its basic and plain white. Space is limited as to where we can put cages in our house. Too many book shelves. We got it from Petco on sale for $30. Its regular price is $40. Plenty of room to strecth a wing. As a matter of fact, as I write this, its on sale for $35 right now.
Good luck.
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Daddy voted to name them "Hurst" & "Jaws"; my daughters voted for Dora and Periwinkle. Daddy lost the vote.