I agree its an odd size. Historically its always been $1000 face bags. $100 face was invented later as the "small size". Go to a local show and I am sure someone will sell you 5 rolls of quarters and halves, (or 10 rolls of dimes).
You can find lots in just about any size on FeeBay, or you can order any face value dollar amount you want from Provident Metals or APMEX, they just won't come in a bag.