I got mine from Mother-In-Need. I HIGHLY recommend her. She has competive prices and, IMO, just a good quality as princesscut.
http://stores.ebay.com/My-Simple-Shop?_trksid=p2047675.l2563
I ordered from her (twice actually, another for my Prada) because princesscut wanted to charge me a premium for a custom size shaper for my Celine. Mother-In-Need did not and her customer service was really great. Princesscut seemed less enthusiastic and less helpful.
HTH!
That's super helpful, thanks! I'm looking on her site but it's hard to figure out what size is appropriate for a Céline Micro Luggage. Maybe she'll know?