If the bank has clear plastic, most tellers will also let you look at their rolls and you can buy only the rolls with silver in them, reduces the cost and bulk significantly. The only down side is you have to watch out for buying foreign coins that look like silver (I usually bring a small magnet since there is a lot of canadian coins mixed in around here made of steel that looks the same as silver.
Also, you're lucky the banks I have asked won't take back the clear plastic rolls as they're afraid they might be shorted a dime or two, so I have to open em all and cash em in loose which only costs the bank more money in shipping it back to the Federal Reserve.
Same concept also works on quarters, but rarely find any.