really there is no set standard price anywhere for mescaline. A dealer can pretty much charge whatever he wants due to the rarity. I suppose 50-60 a gram is reasonable.
around 60 for mescaline HCL. and around 90 for synthetic mescaline. but as omacati said it all depends
well figure a standard dose would be 200-300mg. which is a standard '0' cap. pills of e used to be twenty. i heard they go for 10 now a days. so a 250mg mescaline '0' capsule could easily go for $10-$20 depending on market and clientel. x4 would give $40-$60.
