I forgot what camera you bought Fred. Wasn't it the Rebel Xsi? What will the primary purpose be for this lens? Wildlife, people and events, etc? That will help us make some recommendations. As for new lenses, look at Adorama, Cameraland, and B&H Photo. All have good warranties and competetive pricing. If you want to look at used lenses than you can patrol Craigslist, Ebay, FredMiranda.com, and KEH for the particular lens you want.