If you're an entrepreneur you'd also figure that there is a very good reason for such discrepancy in price.

Then you'd identify and account for reasons (organs go bad, quality might be this or that way, risk of getting caught, logistics,...). If you did it correctly you could figure if some of reasons for higher price can be removed or minimized. And from this we can derive our arbitrage opportunity.

For this case you'd probably figure out that guys in biz already got it covered (these guys are definitely pro's) and that there is really no opportunity.