There are a few ways to do this. 1. As an add on in you chemical. You can offer Olaplex as an additive at an additional cost to your guest. or 2. Raise your prices on all chemicals services across the board and incorporate it "without extra charge". My staff does it as an add on, and I myself raised my prices and include it. In how your guest reacts to your offering has nearly everything to do with your presentation of it. Explaining clearly to them what it does, and how its going to benefit them and their service. As far as the Amazon issue, I tell my clients I will not guarantee anything not purchased from me or my salon, and if they are willing to take that risk, its up to them. When I put it that way, they walk out with it from my salon no questions asked.