The Sports & Fitness Exchange sells mostly used fitness equipment (though they do carry some new/unused items). They sell everything from treadmills and exercise bikes to free weights. All of the items are in good condition and the prices are extremely reasonable. The owners are friendly and very helpful. The inventory is continually changing so we like to go back every once in a while to see what in stock.
The Sports & Fitness Exchange is definitely my first stop when Im looking for gym equipment.