I love turquoise necklaces! I remember years ago being inspired by a woman who was wearing a perfect fitting pair of jeans, a simple white knit t-shirt, cowboy boots (this was in the Southwest) and a chunky bead necklace similar to Angie's pearls but in turquoise instead. It was so simple but so elegant in its own way.
I haven't seen many yet but I always see lots of turquoise in the summer at places live AT, the Limited, etc. Perhaps it's still a bit early? I have a really elaborate multi-strand turquoise necklace that I bought from Anthropologie a few years back - they usually have some nice jewelry. I think BC makes an excellent suggestion about ebay. I recently ordered some jewelry on ebay (from China) - it took forever to arrive but the price was dirt cheap and the quality was excellent!