Got plenty of ranchers in the area that have been selling off underweight livestock due to the drought. Average out about $2 a pound. Even less if you process it yourself. Since I live in an apartment as well, I'll have to borrow a buddys garage, have a BBQ...
Might try to get another lamb this fall and/or go in on a farm raised bison. There's a lot of game in the area as well such as antelope, deer, elk, pheasant and moose so that helps a lot on the budget.
An upright or chest freezer doesn't take up a whole lot of room. Check out an appliance store an see if they carry warranteed refurbished freezers. New ones can get spendy so its worth shopping around and remember to make sure to plug it in an outlet that doesn't have too much of a load going through it already.