I'd say sourcing HR supplies is perfectly acceptable. I don't have any recommendations personally but i'm definitely not closing this as I think it absolutely has HR value.
At one point or another I swear it wasn't allowed, probably to prevent people from promoting scams or their own businesses or whatever but also to maintain Bluelight's neutrality and an absolute red line on sourcing of any sort. I have kind of mixed feelings about as an abstract principle that but I guess I'm glad that it is considered OK now. My personal practice was always to say that it was a gray area in the rules and then immediately PM the person a link to my go-to for injection supplies, lol.To my recollection sourcing HR related supplies has always been acceptable site wide for the time I was on staff, and as far as I can recall has been the entire time I've been a member here. I highly doubt anything has changed.