All year around in this state. Winter, spring, summer, fall, doesn't matter, it isn't like it rains or snows here. 3 days of rain a year? Riding weather all year round.
Keep your eyes open and your money handy. Shit has a way of just popping up, and they usually aren't there for long.
As for the flippers, I'm one of them, if there is a screaming deal, I'll buy it and sell it the next day.
A co-worker bought a 954, uncrashed, with an oil light staying on. For $1500, a year out on the reg. He bought it, plugged the sending unit back in (that was all it was), and sold it for $3000 in a week. Plus a couple hundred registration, so he made about $1300.
The deals are out there. Just because Sammy Stunter wants $5000 for his GSXR, doesn't mean he's going to get it, in fact, most of the guys with the ridiculous prices don't sell their shit at all.
I comb Craigslist every day. A lot of people do. I suggest you do the same, and if something tickles your fancy, don't hesitate.