I wouldn't trust that. Especially since they are selling the Nokia N91 for only $150, and the Nokia 6682 for only $113. Even the Treo 650 unlocked don't cost $150. Don't fall for that, just cause you hear a cheap price. Plus, that seller only has 3 posts on that forum. I would say check Ebay, and find a good price, plus make sure to buy from a seller with "Alot" of positive feedback, and not that much of negative feedback. Plus, Ebay can protect you if you don't get your product in the advertised condition that the seller indicated.

I've seen at Amazon.com for quite some time that you can get it for free with 1-year contract with T-mpbile, free after rebate I mean.

I tend to avoid this type of offer like the plague. Even if they are sending you a legitimate phone you still have a contract not just with T-Mobile but also with the people who sent you the phone, which can have a very steep fee for canceling or altering service. If you are going to use one of the sites that offer free handsets (ones that are normally in the $150 - $200 range or more) or offer to give you money back for signing up with them, make sure you read every single teeny tiny bit of legal text available, preferably at least twice to be sure you understand what you can and cannot do.