I think the one fb101 mentions sounds familiar. Pretty sure I have ordered from them in the past. I think there is another one called bankingsupply.com, generalbanksupply.com and surely several more. Shop around for pricing. Be sure to include cost of shipping when doing your calculations. Shipping can be pretty pricey from these outfits. Also, make sure you get the bag for coin rather than cash deposits and that it is the large size for $50 in pennies rather than the smaller one which only holds $25. Should be rated for 50 lbs. I think I priced these out once and in quantity they ran about 50 cents each.
If your percentages are low.. just sort more. If your percentages are high.. just sort more.
Now selling Copper pennies. 1.6x plus shipping. Limited amounts available.