This one is kind of cool and cheap too
http://www.mytheresa.com/shop/CRYSTAL-PEARL-NECKLACE-p-10943.html#

http://www.mytheresa.com/shop/CRYSTAL-PEARL-NECKLACE-p-10943.html#
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If you can find some Miriam Haskell, I'll bet you'll find what you are looking for. Vintage style (very Chanel like, some of her items), high quality, and not nearly the price of Chanel. Also, Majorica (if you are looking for faux pearls) are the best glass pearls there are, and very reasonable, vintage or newer.
Swanky, you sure you don't want to break down and buy the Chanel pearls?I totally get what you mean in terms of not wanting to pay astronomical prices for costume but on the flip side, the Chanel pearls seem to hold their value just as well (if not for the most part better!!) than real pearls. Crazy but true in my experience.