Thanks. "Using crypto to buy from China" bring the most reliable is making my head spin around
I'm no expert, barely even a noob, so grain of salt and all, but here's my take on it so far... Unless you're getting whatever from a doc or maybe a compounding pharmacy, it's not "medicine", it's "research chemicals" that are "not meant for human consumption". So any domestic company that isn't set up to basically "churn and burn" is skating some thin ice and is probably careful about drawing too much attention. So the few "reputable" ones that you might see mentioned or google up charge immense markups. They make their money while they can, and some people pay it because it looks reasonable when compared to the msrp on proper pharma versions. And unless you get the pharma versions, it's all coming from the same Chinese (or maybe India) suppliers anyway. Even if that's not true, you really have no way of knowing. But anyway, these "reputable" ones selling one vial at a time can be like 20x or more the price of other options. (literally kits of 10x are much cheaper than singles. anyone selling singles is basically scamming you)
There are some places you can find on the site mentioned above that are basically domestic shippers for the Chinese suppliers. They can be 2-3x or more the price of orders from China, which might or might not be worthwhile depending on how much you value (potentially) quick delivery and not having to deal with any international shipping issues. Some of these might have more payment options than crypto/bank transfers, but it's in flux because of payment provider scrutiny. Anything international, expect cypto/bank xfer.
Generally speaking, it's kind of a sketchy business, so start with the assumption that any order has a chance of just never arriving. If you can find reviews that date back a while, especially if you can do so on multiple sites, that's about the best you can do verification-wise. You have no way of knowing if they're all fake of course other than hoping that you'd see other people complain if they were screwing everyone over. Testing that you're actually getting what you're supposed to be getting is a whole other thing, but short of having it tested yourself (which you can actually do), you don't
really know.