Biggest live crawfish?

Why the "biggest"?
Never enjoyed eat those hard shelled bastards

Big is not better. Personally, this late in the year, I'd look for small to medium because big ones this late in the year will be extremely unfortunate to peel and hard to season. I suspect finding medium crawfish this late in the year with as wet a year as its been will actually be harder than finding fricking mini-lobsters.

In short, this is the time to look for crabs, not crawfish but that's just me. These frickers in TX will buy crawfish in restaurants into August and I simply don't get it because they are predictably shitty to eat...

I got 2 sacks from La Lobsters across the river this past weekend. They were a perfect mix of medium to large with a handful of really large thrown in there. I had no problem properly cooking, soaking, or peeling them, and they turned out tasty. It's still pretty easy to find qualify crawfish.