Free: Contests & Raffles.
Embrace simple, lightweight shelters (TARPS). Embrace simple, lightweight, easy-prep homecooked foods (google "logan bread" and "freezer bag cooking", look on the kifaru site for lightweight food recipes, search for a discussion thread on logan bread on 24hourcampfire). Buy a sub-3lb sleeping bag that has a draft collar and is good for 20F. Determine whether you can get away with just a ridgerest pad, or need an inflatable, and remember how much weight you saved by sleeping under a tarp. Ridgerest alone saves you another pound over a thermarest. Get rid of anything reflective on your clothes. Don't wear blue, black, or white (in general - exceptions made for snow).