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Humasson mfg in Ancaster Ont has the best price and selection. I am not sure what shipping would cost. Your best bet might be go in on a larger order with friends or a gun club. A lot of local shops stock limited quantities or will order for you, but you will be around 58.00 for 25 lbs.
I find buckshot to be expensive and I just bought a Lee mound to cast my own. Even paying $2/lbs for lead, my buckshot reloads are only $0.35 each vs. $0.75 for factory shells.
Higginsons has Lee stuff - probably the moulds. A saw shot at the Gun Dealer, in McAdam, NB, a couple years ago (first place I ever encountered with an aisle of shot and wads, and hulls, etc...