Well there aren't really mescaline dealers like there are weed dealers... mescaline isn't a high demand product on the street. 25g varies greatly for everyone... some ppl experience a full blown trip for hours on end, others need 50g for threshold effects. Personally, i like doses of around 30g because it lasts for many hours but is subtle enough that I can still enjoy walks/meditation. If i up the dose too a full blown trip the visuals/colors are intense but I don't function that much. I don't think many people out there would need 400 mescaline trips, it's something you dip into once in awhile, not every day.