I have been looking everywhere for lead shot also,seems to be on the endangered list,Use to get it at wholesale sports but none of the stores seem to carry it .I use it for light loads for the wife and I shoot the holy black so I have to reload, anyway I did find this site
http://www.rotometals.com/Lead-Shot They have everything you could want.If you have a U.S. address,or a friend there most shipping is free,if not be prepared to Pay .I phoned them and they quoted me shipping on 50lb ,it was $89 and $147 for 100lb of 71/2 shot.
I checked out Bill Bilozir did not see any lead shot only bismuth and nice shot very $$$$
compared to lead.