When it comes to buying a phone, you've got a few options. There's the official, carrier-subsidized route, which generally is the cheapest option. You get a discount on the phone in exchange for signing a contract with the carrier, usually for two years. There's the third-party route, such as eBay and Craigslist, which sometimes can help you find a deal, though generally not as good as with a carrier subsidy.
The most expensive way to buy a phone normally is "unlocked," meaning that it's not tied to a carrier. If the phone radio has the correct frequencies, you can use it on T-Mobile, AT&T, Sprint, Verizon, whatever.
We've already seen pricing for the HTC Touch Diamond 2, which unlocked will run between $500 and $600. Now we're starting to see pricing for the Touch Pro 2. And you're going to have to dig deeper for this one. In Singapore, an unlocked TP2 is gonna cost you a decent laptop, or about $880. Ouch.
So, either start saving those pennies now, or be prepared to wait for the carriers to release it later this year.