Just in time for summer vacations, safaris, and baseball there are new instant save rebates for some of the Canon telephoto zoom lenses. You don’t need to do anything for the rebate or send anything in, it is an instant savings built into the sale price.
All of these are pretty basic quality lenses, but if you are looking for an affordable telephoto zoom to give you more reach for those sports, wildlife, and travel, now is a good time to buy.
If you are going to purchase any of these, I would suggest going with the EF 70-300mm f/4-5.6 IS. With any lens, you get pretty much exactly what you pay for, so pay a little more for better image quality, color, contrast, and image stabilization. You can learn much more about lenses in the Lens Category of posts here.
If you are looking for a high quality zoom, consider one of the Canon L lenses such as: