Find a recycling bin that has one specifically for colored glass. You will have more than you could ever use. Make certain to go right after a holiday where party drinking is a norm (ie New Year's, Halloween, etc).
I've got to suggest the Budweiser American Ale stuff.. it's drinkable and 99cents near my house.. the empty bottles are the same price at the LHBS .. the labels come off really easily (cheap glue) and theres no imprints on the bottles..
There's even a map of where to find them on the Budweiser site (too lazy to look!!)