Shipping plant material internationally is not an easy thing, Jordi. I kind of doubt you'll find anybody willing to risk it other than a commercial nursery who is set up to do international shipping.
Your best option is to make friends with gardeners in your area and ask for cuttings of the plants you like. I have a copperleaf, (I think it is an Acalypha) that I got as a cutting and it rooted with no problems at all.
