Get the padded flat rate envelopes...you should be able to get 4 magazines in there, no problem.
I'd sell the magazine bundles for $6 or $8...+
$4.95...out the door!
Most peeps don't want to pay more than 2bucks a magazine unless they are looking for something specific. Hope that helps.
We love to buy magazines on this board..sell some here and then you won't have to worry about selling them in your garage sale...