Someone asked about record stores in Seattle a while back. 
Here is one that specializes more in the indiepop genre but if you are in search of the Leslies cd he put out in the US or the Dolly Mixture box set that just came out in the UK he's your man: 

Jigsaw Records 
record shop / mailorder / label 
5459 Leary Ave NW, 2nd floor 
Seattle, WA 98107 
http://jigsaw-records.com 
http://twitter.com/jigsawrecords