Hi Vronica - I'm in the UK and I buy quite a lot of craft supplies on eBay (you can use the advanced search facility and pick 'available to' your location to make sure you get results from US sellers who will ship to Europe). I've bought Cbug folders, ink pads etc this way. You sometimes have to ask for shipping rates but most sellers respond to questions very quickly.
I've ordered stamps from
Cornish Heritage Farms several times. They have a flat rate deal of $12 for international shipping (unless you order cardstock and then a surcharge applies as it has to be shipped differently) and each time I've bought stuff there the shipping as been fast and the stamps are excellent quality. Lovely people to deal with, too.
Have fun while the exchange rate is good!