Here is the listing for the bead cores on ebay, I bought them from the seller 8 Seasons so if this listing is sold you can find it again: ...
by Maison ZiZou
by silvarruxx craft
by papermodels93
by Potomac Bead Company
by Hectanooga1 - Crochet, Knitting,
by Florencia Vallejo
by Best DIY Ideas