Not sure how you were searching but I just Googled "marianne designs don and daisy" and found Canadian, US, Australian and UK sites with Don and Daisy stamps - not a huge selection at each place but some (so you could maybe ask if they can get in something you want if you don't see the specific stamp you're after).
This place had the most of the US ones I clicked on:
Scrappin' Great Deals. Here's the Google results I got if you want to browse round some of the other places:
Don and Daisy Google results.
HTH!
stamps from the Netherlands
Linear Mode
