Trade it in on Amazon.
You can trade in your functional smartphone, tablet, or eReader for high-value Amazon giftcards. Your item must still work, be in good aesthetic condition and you must still have the original packaging. I can get up to $130 for my black 16gb iPhone 3GS, though I think I would probably get slightly less than that, since my iPhone exterior is a little bit scratched. That's considerably more than I can get from other trade-in services or on eBay.
Here are some trade-in values for recent older model iPhones, iPads and Kindles:
- iPhone 4S 64GB - up to $500 credit
- iPhone 4S 32GB - up to $450 credit
- iPhone 4S 16GB - up to $415 credit
- iPhone 4 16GB - up to $300 credit
- iPhone 3GS 32GB - up to $145 credit
- iPhone 3G 8GB - up to $85 credit
- iPhone 2G 8GB - up to $25 credit
- iPad 1 16GB, wifi, & 3G - up to $235 credit
- iPad 2 64 GB, wifi - up to $435 credit
- Kindle 2 DX - up to $61 credit
Check here and see what your older version electronics will bring in on Trade-in.