Licensed Bike Geek
Join Date: Oct 2002
Location: Los Barriles, Baja Sur, Mexico
Bikes: Kirk Terraplane, Serotta Ottrott, Spectrum Super Custom, Hampsten Carbon Leger Tournesol
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If in fact you seatpost is a 28.0, you can buy a smaller diameter post, and buy shim to fit the new post in your bike.
Are you sure that your post is a 28.0? I can't find any reference to one that size. Posts jump from a 27.4 to 28.6, no 28.0/.
Ask your LBS if he has a QBP catalog. If he does, in the 2002 issue, on page 531 are the listings for the shims I was referring to.