Hi Sofie, I haven't tried these, but it's a starting point. The shapes are different also.
http://stores.ebay.com.au/ayliss_She...QQftidZ2QQtZkm
You could try searches on ebay for Mother of Pearl beads, read feedback to see what other buyers thought.
Its really a matter of research and trial and error to find the quality you're after
Cathy