Unlocked 8320 for $499 at tigerdirect.
Blackberry Curve 8320 Unlocked GSM Smartphone - WiFi Support, QWERTY Keyboard, Speakerphone, Bluetooth, Instant Messaging, Pale Gold 8320CurveGold at TigerDirect.com
Note at the bottom of the page says:
"Please Note: Most of our unlocked cellular phones are only designed to work on GSM networks such as Cingular and T-Mobile (in the U.S.) and Fido and Rogers (in Canada). These phones are NOT compatible with CDMA carriers such as Verizon and Sprint. If your intended service provider is not among those major carriers, please contact that provider to determine GSM compatibility."
They sell the unlocked 8310 also for $519.
Good luck and happy holidays.