Modern chickenwire is very non-predator-proof, I would NOT suggest using it at all (except *maybe* to separate one pen of chickens from another pen of chickens, or for garden fencing)
So, eliminating that, yer reasonably-predatorproof choices are: 1/2" hardwarecloth (expensive), 1x1 welded wire mesh (middling-expensive), 1x2 welded wire mesh aka "cage wire" (middling-expensive, make sure you get heavy gauge), or heavy-gauge 2x4" welded wire mesh fencing (less expensive, but do make sure you get heavy gauge and well-welded, and you should add something else smaller-mesh on the bottom 2-3' or anywhere else predators will potentially be directly on the opposite side of the wire from the chickens).
You will see 2x2 and 2x3 welded wire out there, sometimes at a somewhat attractive price or anyhow the same price as 2x4 and you may think "hey, they're smaller holes, they must be more secure than 2x4 wire, so I shall buy some, eh?" but unfortunately I have only ever seen them in REALLY thin weebly garden-grade stuff, not heavy duty well-welded predator-proof versions. So I would suggest you steer clear of them. You want something that is, like, livestock-type fencing.
Big box stores such as Home Depot, Lowes, etc usually have *some* hardwarecloth and 2x4 wire, sometimes other types too. However their selection is limited and they do not always have the widths you want. I would suggest trying your local feedstores or farm store (including, but not limited to,
TSC if you have it in your area). Note that mom n pop feed/farm stores often do not have the stuff out on display, you have to *ask*, and they may not have what you want in stock but may be able to order it if you ask.
Good luck, have fun,
Pat
