i've done a test run on the ibiza ikea website.
you click items into your shopping trolley just as on any conventional internet shopping site, the only difference is that when you check out, someone from ikea rings you for your credit card details.
i ordered 4 wardrobes, 2 night tables, 2 pool loungers and 2 sets of drawers just before easter (total €677 with no delivery charge) and it all arrived in a central warehouse in ibiza this week. i decided not to collect it myself, but to pay for transport and installation - an extra €130, which i think is pretty good. it's arriving any minute now................