You offered “constant supply” as an option, but (and this may just be me being particular about the verbiage used) the more appropriate phrasing should be “consistent supply,” as it suggests uniform availability and quality.
As for “other,” I feel that, so long as it stays within legal boundaries, as much oversight re both vendors and clients alike should be prioritized. This was touched on by a number of other respondents. Referrals/someone vouching is good, but a video qualifier (ex: username & the date written down along with a phrase requested by an admin displayed in a video clip of the applicant using his/her drug(s) of choice. On the vendor side, a policy of zero tolerance for false/inaccurate product descriptions. Further, though this is likely highly dependent on the specific vendor, a means by which to order certain items in bulk qtys, rather than multipliers of small qty offerings.
Another “other” for me is inclusion of additional vetted vendors domestic to the US, ideally with the potential for regionalized representation. Additionally, I’d like to see current lab test (GCMS) results for the products on offer by any vendor.
Lastly, and this is likely already posted somewhere though I’ve yet to locate it, a list of requirements a user must meet in order to be considered for permission to become a vendor.
The last thing I’ll say is an opinion and it’s this: I have immense respect for this site and the principles on which it was founded. Could some simple things be tweaked to enhance the client experience? Sure. Merely the inclusion of a third party holding transaction payment in escrow until receipt of and satisfaction with the delivered materials is outstanding. Keep up the excellent work! Keep striving to improve and empower the clientele to affect positive change. What you’re doing is impressive, and I’m excited to see what the future holds!