If you missed the Bicycle Coalition of Maine's two great bike swaps, here's yet another one where you might find some great bargains. Gorham Bike and Ski, 1440 Congress Street in Portland (near the Westgate Shopping center), is having a bike swap this Saturday, May 17. If you've got a bike to sell, bring it to the shop from Wednesday through Friday. If you're looking for a bike, turn up between 10 a.m. and 2 p.m. (but remember, early worms do get the best stuff). Get more details on the Gorham Bike and Ski Web site.