It is best to sell them as sets of 6 !! Check ebay to see what they are actually selling for !! Not asking price but completed sale and sold prices !! You can find it on the left side of any ebay listing page !! Asking prices and sold prices are not always the same !! Most all glass prices have been in the ditch lately except the higher end items !!
If you need any help getting started just ask here !! I am always glad to help !!