Keep in mind that when you buy "discount" from a supplier other than the manufacturer, they may be factory seconds. I've seen Smith &Alexander thin grips sold in just such a manner, as well as other 1911 parts. Buyer beware indeed.
You may want to try http://www.cdnninvestment.com. I have purchased 2 sets of Chip McCormick's grips from their site.
The prices where approximately 30% less than anywhere else.
They have a great assortment of closeout items and flat shipping cost regardless of number of items.