$20 dollars for Viagra? That sounds high to me. That sounds high even by US Standards. The only ones I knew that sold Viagra for $20 dollars are the bathroom attendants in AB, but the pharmacies have always been way cheaper. But I haven't brought Viagra in years in TJ because I buy Levitra in TJ which is a little cheaper than Viagra, and I recall I use to pay about $ 13 dollars, and remember paying about $15 dollars for Viagra, but I remember guys like Scatmandoo use to talk about buying Viagra as cheap as $10 dollars at places like Costco, but it's been awhile since I purchased over-the-counter Viagra, because I now have a prescription from a US doctor which the insurance allows me to buy a few Viagra pills a month for about $10 dollars a pill, and I also now use internet pharmacies where I buy Sildenafil Citrate( Viagra generic like Ed medicine for less than $5 dollars a pill. ( They work as well as Viagra)
So I'm not up to date on ED medicine prices in Tijuana, but if I were to guess I'd say Sampson's driver is including a mark-up which is OK as long as the mark-up isn't too high.