This vendor has a listing for 6-APB, with a description of 98% pure. In a pm he also says its the HCL salt.
A little research on reddit tells me this could be a lie. Several threads mention that the HCL is more time consuming to produce; and any 6-APB synth will yield a portion of 4-APB, which again is time consuming/expensive to separate.
The vendor declined to provide any testing info and I'm unable to find any threads discussing the quality of his 6-APB. It sounds highly unlikely that he's selling 98% pure 6-APB HCL.
Can anyone vouch for him?
Go with your gut. 6-APB*HCl hasn't been seen in years.