Install and hide cable lines yourself. If you've got carpet, use a pry bar to loosen the rug at the tack strip along the room's perimeter, and fit the cable in the space under the baseboards. Rent a carpet kicker to reinstall the carpet. For hardwood floors, remove the quarter-round or shoe molding below the baseboards. There's often enough of a gap to fit the cable.
Cost: $14 for carpet-kicker rental.
Savings: About $90 for a 3-hour custom cable installation.
Bonus: Use the kicker to tighten up any loose carpeting.