How do I pick a cologne or aftershave lotion out for my boyfriend without him knowing?

My guy will wear different aftershave lotions or colognes if I like it usually. They all smell differently on his skin. I was intending to get him some for his birthday. He does absolutely hate to shop or go into a store. If he does go into a store, he gets exactly what he wants and marches right out. He doesn't shop like me. How would I get him to try on a sample or two of something just to see how it smells on him without him knowing that I am considering buying it for his birthday?

How do I pick a cologne or aftershave lotion out for my boyfriend without him knowing?
Post Opinion