The most inexpensive way to bluff is usually the semi-bluff re-raise on the flop for a free card on the turn. Any time I flop a clean 8 outer, I'll usually re-raise any bet to isolate the two of us and get a free card. If the decide to come back at me on the turn where I've missed my hand, I'll lay it down unless I've got some fancy read on him and think a bluff would work nicely.
-'rilla