750am the game has an android app but once the actual game starts I think it stops working. The NBA has a radio league pass type thing they want you to buy.
There is an iPhone app called NBA Game Time. If you pay the quite reasonable 2011-2012 fee ($7.99) for iPhone League Pass audio, you can get the audio on your iPhone. You can get video also ($39.99), but that's not such a good idea while driving . I suppose it comes and goes depending on the availability of cell towers where you are driving. The bad thing for NW residents is that you might be blacked out.
does your car not have an AM radio? 750 the game reaches tacoma. All you need to do is find what station picks up the blazer games in Seattle..
Sprint has a gametime app for free if you have there unlimited data plan. You can listen to any game with your choice of which sides announcers you want to listen to,