If you've recently purchased a new BB and have an old working phone or PDA around, you can get some money back by sending in the old phone.

Purchase an eligible BlackBerry 7100i, 7105t, 7130c, 7130e, 7130g, 7250, 7290, 7520, 8100, 8130, 8300, 8310, 8320, 8700c, 8700g, 8700r, 8703e, 8705g, 8707g, 8800, 8820 or 8830 and trade-in a qualifying device and receive the fair market value plus a $20 rebate. Purchase of new equipment must be made between October 22, 2007 and November 30, 2007.

As long as the phone works, and you have all the chargers/cables/software/manuals that came with the phone/PDA, the typical assessment is around $8. (That's my valuation for a four-year old Nokia phone in good condition). Or an old Palm Tungsten E in good condition brings $29.

All you have to do is:

• Fill out a request (here)
• Fax/mail a copy of your receipt along with the confirmation email
• Send the old phone back using the pre-paid label

Looks like this has been an ongoing deal, so I am guessing RIM will start another period beginning December 1.

As others have stated, if you have a working BB, you could probably get more money from eBay, or keep it as a backup (which is what I'll do with my 8700c).

For me, this will fund a microSD card for my soon-to-be-purchased 8310.

These guys gave me a hundred bucks for my used MDA! W00t.