Top Result: Nikon 70-300mm f/4.5-5.6G ED IF AF-S VR Lens
Note From Jim
This is a though price point. Frankly, I think it will be worth your money to save up for a little while longer until you can afford a Tamron 150-600 in the $1,000 price range. However, if you're dead set on getting a very inexpensive wildlife or sports lens, then these are your best bet. You may be very happy with the 70-300 as a casual photographer, but for most it will be worth the effort to wait and save up.