Fellow Minnesotan. I think the only Sonys you are going to find are the 350s. I got mine at Best Buy & the last I looked most BB still have the 350s. You probably won't find any other Sony readers in the state. At least I haven't found any. The only other option is to go to Sonystyle outlet & get a refurbished Sony 950 for $189.99 (when you check out that is the price that will come up).
Otherwise you can get some through Amazon but the prices are outrageous & more than Sony was charging in the first place.
I love my 350 & could have gotten a 650 or a 950, but once I got the 350 I felt no need for any other size. Just my personal preference. I do have a Kindle 3 & a Nook Classic so I do know about bigger sizes & being able to buy via the reader. Downloading is quite easy so I don't miss directly buying.