I've been searching through every coin that's passed through my hands over the last six years or so, and never found a single 90% coin. The best I've manged has been a handful of 40% halves that I've gotten from the relatively few amount of halves that I occasionally pick up at banks. I usually put most of my efforts into penny sorting, so the halves are more of a rarity for me. Anyways, today I went to my local bank to pick up some pennies, and on a whim I decided to inquire about halves. The teller says she has plenty and proceeds to pull out 10 CWR rolls. I only had enough $ to buy two of them. So I get home and open the rolls, and am quite pleased to find one 40% half in each roll. Being quite stoked, I grabbed another 80 bucks and headed back to the bank for the remaining rolls. Ten more 40% halves and one beautiful, shiny 1964 half were the result!
I think I'm going to make a concerted effort to start asking for halves more regularly after this bonanza.

From today's melt prices:
12 X 40% = 52.32
1 X 90$ = 10.67
Total- 62.99
Not too shabby!
Good luck to everyone in their searches.