IIRC, I built two cages, both about 4 1/2' x 4 1/2' x 4' deep for around $160. That includes plastic mesh, PVC fitting and pipe, zip ties, etc. I had chicken wire here that I used for a lid.


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).