I got it now. Well, I think GlassCages is on the East Coast. that's why your shipping is more. A.G.E is in Texas. A.G.E doesn't sell direct to the public - must go through an LFS. You can use any LFS - doesn't have to be Aquarium Concepts.
FYI - A.G.E's niche in the custom tank market is the 1" PVC bottom - you can drill as many holes as you like and not risk cracking the bottom. I didn't do any closed loops, but still like the PVC bottom in case my rockwork topples over, which could possibly still crack the glass.
A.G.E will also do an acyrlic overflow, which I feel looks better than the glass overflow.
I heard GlassCages does sloppy silicone work?