The ones on ebay are just as good as the ones you buy at a drug store, just a hell of a lot cheaper.
4fingerlid
It happens. If you have slow metabolism, usually because of age and some extra weight it can take a long time to burn off the fat cells to rid yourself of the thc metabolites.
Excersise, high fiber diet and time is all you can do.
The only other option will be subbing.