Sweet Impressions stamps are now sold by Stamp Image Studio, a wonderful papercrafting store located in Fowlerville, Michigan:
http://www.stampimagestudio.com/index.html
Here's their direct link for Sweet Impressions online shopping:
http://www.shop.sweetstamps.com/main.sc
A couple of my SCS friends and I were fortunate to recently shop in the in the Fowlerville store. The owner, Stacey, was wonderful to deal with, and even demonstrated parchment craft techniques for us.
For those interested, she will be at the Rubber Stamp Show in Southfield, Michigan, May 31 - June 1. Here's more info:
http://www.stampscraparttour.com/infopage.asp?id=5
Hope that helps!
Linda