Yep - recruit your beer drinking friends to save bottles - pay em back with some full ones.
Also, bars, restaurants and redemption centers - offer to give them 10 cents a bottle and a few brews if they will save you the 22 ouncers.
In particular, go after the 22 ounce bottles - bottling is twice as easy when you have half as many to fill.
And, even ask if they have any old kegs laying around. I was getting bottles from our local BMC bar in town. Got along well with the bartender/owner. Saw he had a bunch of old dirty soda kegs laying in the basement when we were getting bottles - asked about them. Told me they had been laying there since he started running the place (years) and I could have em if I wanted them - scored 8 5 gallon kegs. You just never know.