2000 ford expedition soft breaks, Needs to be bled. Price?

The breaks on the truck i'm getting listed above are soft they work but the pedal goes all the way down and i was told they need to be bleeded how much would this be to get done?
Its below 10 degrees out and i can't do it now since i have no garage or place to do it in.

I hope that you are getting this cheap because this could easily be a bad master cylinder. The rear drum BRAKES may not be self adjusting. You are buying a car that barely stops WHY?

NEVER by a vehicle with known problems without a COMPLETE inspection by an independent 3rd party. IF the brake pedal travels all the way to the floor, it is LIKELY that the problem is more than the lines needing bleed. In fact, IF that is even part of the problem, whoever serviced the brakes last did something wrong.

I'll bet you have frozen caliper slides and need a complete brake job. Go to a different place than the bozo that said they just need bleeding! You'd have a leak if you got air in the lines.

You have a leak.Air doesn't get in there magically.I'm assuming you live up north with a 16 year old car.Brake lines are probably rusted out.Time for a new car.