I'm going to be in seattle and wanted to find out if I can buy it for a reasonable price (perhaps not the best price) there. I like buying from local stores.
The best bet on of the Marantz is to buy an Oade Brothers modified (but brand new using modified pre amps) unit on-line. Why? because if you want clean audio using mic to recorder a stock unit won't do, they need new clean pre amps. I know this well, I have a stock 671 and it needs to have a mixer in front of it to get clean recordings. It really pissed me off when I got it and found the unit wasn't at all clean as I expected. Going line in, using a mixer, makes it clean, but there are times (gathering ambient sounds in nature) I would rather only take the recorder than have to lug around a mixer also just to have a clean front end.
Back to finding a Seller: As stated above, if you're in the Seattle area the DVestore way up north in Marysville (40 miles) is a place to look but you'll need to set an appointment, they're a warehouse, and that's "if" they have one in stock. There are a few other places, but I strongly suggest buying a pro performing level unit from Oade rather than a hissy stock unit.
If you're only going to be in Seattle; there' a Guitar Center that has a bunch of audio stuff. They have the pmd661 online, and you can call to see if they have one in stock.