The only store in the area I have found Pentax on the shelf is
Kenmore Camera at the north end of Lake Washington.
They are a little off my beaten path, so I have only been to them once and that was over a year ago. A very impressive store if you have time to get to it. I end up using B&H for most of my camera shopping.
Yes, I have a K3, but my user name is more related to my family situation, I'm the third K, out of four, we can't come up with many different names in my family. Have to wait until my son has a son, so I can give him my K5.
Enjoy your stay, we may get some sun over Saturday and Sunday if the forecasters are right.