Just buy a 3 pound roll and make Wendy's style hamburgers yourself.
2 plastic plates and some cellophane. Lay down about a foot square piece over 1 of the plates.
Then grab and roll into a ball about 2 inch of burger. Now loosely wrap the ball just smashing it down a little. With the 2nd plate place over top and smashing it firmly but not too much.
Remove the plate and wala Wendys old fashioned square hamburger.