To see an inexpensive alternative to shaper shorts, read more.
On my drive home, I was trying to think of a way to halt jiggle while saving moolah for my friend when I had an aha moment: why not take an old pair of control-top pantyhose, like these Hanes High-Waist Control-Top Pantyhose ($7, originally $9) and chop off the legs! That way, you can salvage the control-top portion and use it as makeshift shaper shorts. Use high-waisted pantyhose like these if your tummy is your problem area, or regular rise for strictly tush issues. Just make sure it's sturdy enough to suck you in.