It seems that the 3/4" one sell for about $1.00 each. these are the commons. the flames, adventurine, gold, or other rarities sell for more. there was a flame that was oxblood, eggyolk, and other stuff that went very high on abay. it was a one of a kind i was told by my favorite Notre Dame grad. I cant afford the high end ones but would pay more than 1.00 for some. These new 1" ones may go higher than 1.00 because it takes more glass and effort to make these. still not bad. of course the rarer/nicer ones will go for more.
but in the end something is only worth what someone is willing to pay for it.