I understand the allure of breathing life into old crystal scanners, as I've done so myself, but for the cost of one or two crystals from a retailer, you can buy a used programmable scanner. You just have to be patient and watch for the deals.
I only populated my (free) crystal scanners because the ex-manager of a RadioShack gave me his compartmentalized box of about 50 crystals from his old store, and some of the frequencies were still in use.
Good luck in your search, anyways!