Where can I found a lot of jewelry wire?

I need a lot of jewelry wire. I mean, I don't have a specific number, but I'm an artist and I'm looking to basically cover a 12' x 8' wall in crocheted jewelry wire. I spent my past few months in Florence, where I relied heavily on a craft store called Zest! They stocked wire wrapped around wooden sticks (literally, narrow rectangular wooden blocks) from 24-28 gage, and each of these sticks had a good amount of wire. By this I mean I have crocheted part of my piece that is 6' long x 4' high using the wire I found there. Specifically, I need wires in variances of blues and greens, and copper coloring is also greatly appreciated. Craft stores don't seem to stock enough of the wire I need. Any ideas? Thank you!