If you want to go locally XT has some Marushin .30g BB's for sale (can't tell if they're in stock though, give them a call first):
Otherwise you'll just have to settle for .28's: http://xtreme-tactics.com/store/prod...roducts_id=172
Otherwise Jeff at Capital Airsoft has .30 Madbulls for sale but they seem to be out of stock at the moment: http://www.albertaairsoft.com/store/...id_product=130
But honestly .28 is probably good enough. I know that .02 grams may make a small difference but it's probably not enough to go out of your way to try and find them (well that is unless you're a sniper who wants the best available BB's).