Talent Testing Service (mostly referred to online as simply "TTS") is the industry standard among the "content creator" crowd. They're a bit pricey in my opinion at well over $200 but their network is extensive and some people won't accept anything but them. Easy because you can just share QR codes to verify recent results.
The stdcheck website mentioned above is one that I've looked into before because price seems reasonable and they have an extensive networks here in the Dallas area. I believe Quest Diagnostics partners with them and I like Quest from previous non-related experiences.
I use the Everwell company. At $160 I can do it on my time and just drop it in the mail. Most times the lab it gets sent to is right here in Dallas and I have my results literally within 72 hours of pricking my finger at home. Other times they'll be dispatched to Washington state and that takes a few additional days. I have an online profile that the lady can check out live, no screenshots or "trust me baby" involved. And while I say $160, they run specials on amazon at times where I load up at cheaper prices and keep a supply on hand. The tests I receive are usually good for about a year. The bad reviews I've read center around "got lost in the mail", "no way this was right", "never received order." Another good thing about Everwell is that, should you come up positive for something, the consultation and treatment prescription are covered in the initial cost of the test, I haven't a clue as to if other testing sites/companies provide this or if they would charge additionally for treatment authorizations.
In my research, I did find some free options here in the area but they wanted me there way too early in the morning for my tastes, so I pay the $160 to sleep in