captainFrom what I can tell, dice sets tend to come in 12, 14, and 16 mm sizes with the price increasing as the size does. The only carnelian set I found on GMdice was listed as 12 mm while these are advertised as 16 mm. And since GMdice sets seem to increase by about $12 from 12 to 14 mm, I'd imagine their base carnelian price of $26.95 would go up $24 to roughly $50 were they 16 mm. Without the shipping and felt bag price included, the set here cost me $35 which amounts to a calculated savings of $15. I imagine it's more complicated than all that, but that's what I found.