I've bought from an Ebay seller before, and I plan to do so again.
http://stores.ebay.com/thesweetattackvacpak
I bought a set(?) of 50 each pint, quart and gallon bags. You can check the physical measurements at their store site. I remember doing the math quickly, and it averaged out to: pint bags were about 20� ea., the quarts were 30�, and the gallons were 40�.
No matter which size bags you buy, they're much more frugal than FoodSaver bags.
No relation to the seller; just a happy customer.
Good luck,
T