How wide (high) a roll of <whatever type> wire fencing you can get seems to vary GREATLY from place to place. Even the types that are available vary from place to place -- only this year have I seen green vinyl-coated metal hardwarecloth in stores here, but apparently some folks elsewhere have had it available for some years.
Because of the high costs of shipping big heavy rolls of fence wire, the only thing that's really relevant is what you can actually GET in your area. Make sure you ask about what's available by special order, if you're wanting like a roll or two (not just ten feet
), because store employees won't always volunteer that possibility -- but even so, you will just have to see what your choices are and pick accordingly.
It's not such a terrible thing to have to seam two pieces horizontally, if you can't get 5' or 6' tall stuff. Use lotsa cage-clips or hog rings, or sew the pieces together with some good-sized galvanized wire (like at least 16 gauge).
And even if you know people who've used chickenwire for years with no problems, if you're thinking of using it yourself, please browse the 'something killed all my chcikens' type threads in the Predators and Pests section to see what does happen on a fairly regular if unpredictable basis.
Good luck, have fun,
Pat