Get up to $300 when you trade up to an HTC phone
The HTC Trade up program reimburses you for replacing your current phone with an HTC model
HTC has a quote calculator on its website that lets you plug in the name of your trade-in phone's manufacturer, the name of the model, and after you reply to some simple questions about the device, a quote pops right up. For example, we punched in the BlackBerry Storm 9530 and found out that HTC would give back a whopping $20 for that model. On the other end of the spectrum, an Apple iPhone 4S (16GB) commands a $215 check from the Taiwan based manufacturer.
This offer looks to be quite a timely one with HTC introducing its new line of Windows Phone 8 models on Wednesday.
source: HTC via DroidLife
HTC's quote calculator gives you an idea of how much you will get back from HTC