After spending half the day looking at Effie Calavas jewelry and seeing every stores selection between the grand canyon and williams. I fond this store to be the most farily (lowest) priced. They gaurantee authenticity, however, their garauntee is simply a hand out of the artist with the artist's picture. Although I have yet to find a place, even in GC where a reliable authenticity certificate is issued (with batch#, artist signature, thumb print, etc, etc) to verify the jewelries authenticity.
The piece I bought came out to 208 after taxes. After searching the web i found the same piece for 189, and similar pieces for 70. All "garaunteeing" authenticity.
The overall selection in the store was much better than anywhere else. They had artist from all over the southwest and the jewelry was generally of greater quality than the trading posts, and gas stations of the grand canyon - williams corridor.
In the end if you see a piece you like, money is not much of a factor, and you enjoy th peace of mind that you are more than likely getting an authentice piece (according to sources there are/were many fakes from abroad , i.e. CHINA, I would recomend buying from them. Just dont try to find the "real" price on the web.