Amazon has the Osiana Swarovski Crystal Pendant Necklace (several colors, NK-013-3) for $25.99 - $15.59 off with coupon 63295ASE (Ends 11/25) = $10.40 with free shipping. The pendant is completely nickel-free. Has excellent Amazon Reviews.
Amazon has the Brilla Swarovski Butterfly Teardrop Pendant (Blue or Clear, GZJW001) for $24.99 - $10 off with coupon TOMMYBRI (Ends 11/30) = $15 with free shipping. It features a 17" chain, sparkling Swarovski Elements crystal in beautiful blue.
Has good Amazon Reviews.