i got a small deep freezer at sears for maybe $150- it's the size of a minifridge. it's at 0 degrees, so milk is good up to a year. and when i'm not pumping, we use it to store bulk frozen foods :)
oh yea- be sure to freeze bags laying flat. Saves a ton of space. Then I stand them upright and store about 10 in a gallon sized ziplock to help keep them organized. .