If you don't have any tolerance to opiates you can find Buprenorphine recreational at very low doses, when i started triying Buprenorphine with a low dose of 0.3mg i could have some effect from it, raising the dose to 1mg (without tolerance) had me felling pretty sick for about 2 days.
Then when i have meet strongest opiates (not every day, once a month or two months) the Bupre had no effect on me like before and i can take 1mg and not fell sick.