When you're pricing wire, be sure to understand what you're getting so you can compare pricing properly. Galvanized wire comes in two basic kinds: galvanized before weld (GBW), and galvanized after weld (GAW). GBW wire is cheaper and not as strong because the welding strips away some of the zinc where the horizontal wire meets the vertical wire which makes these connections vulnerable to rusting. GAW is more expensive and typically a better product than the GBW. I bought some cheap GBW wire to use for an apron for my last run and noticed as I was installing how easily the welds broke. I never had that happen with any of the GAW wire I've used before.
Another point of comparison is the thickness of the wire, or the guage. The lower the gauge, the thicker (stronger) the wire, and the more expensive. Finally, there's wire spacing, the size of the spaces between the horizontal and vertical wires. The smaller the spacing, the more expensive the product (all things otherwise being equal).