You tried Craigslist? [It sounds weird, but apparently that's how some people get other people to look into things on the DL-- not that she's ever tried it, but she hears it's a thing that can work if you find the right person.]

Honesty time? I really think you should. I know I've put stuff up my nose I shouldn't, so I can't talk without looking like an asshole, but this shit will kill us if we're not careful. I'll keep the jar well-stocked if you'll toss your stash. Deal?