Roll Hunting?

Has anyone been having any luck roll hunting?

I just started about a month and a half ago, and for the first three weeks I was on fire. But it has died down for me lately. I went to the bank just today and bought $200.00s worth of halves. I found 1-90% and 5-40%. But for the past 2 weeks I have only found maybe 3 or 4 40% coins. I'm starting to think that I've run the area dry.

I can't complain though, because in the last month and a half, I have found 13 rolls of 40% and 3 rolls of 90%!