Personally, I think we get grossed out over something that was already touched by other humans anyway, myself included. When we purchase new items, we take it home and wash it anyway, so what is the difference? Some don't even wash. Sometimes people sell these items because they have barely been used.
When my daughter was born, my husband wanted only the BEST for his little girl. I had no problem taking a bag of used clothes and he turned his nose at it. He would stop at the mall and buy her a new outfit. Well, after he saw some of his items were so dressy and we had no where to go in them and she had already grown out of them, he let me do what I do. My daughter is a big girl and grows out of her clothes every 8 - 10 months, now at the age of 5. It has always been this way other than the infant stages and then it was sooner. She is five and wheres some size 5 (very few), mostly size 6, and 7/8's. The 7/8's are the used clothes so perhaps they have shrunk in the wash.
I say buy them and if he is that set against it, set them aside and buy a few brand new ones. Eventually work them in. Don't we all drink out of the same glass at a restaurant? It's washed and sometimes not so great. I like a straw so I don't put my mouth on the glass where others may have (makes me feel better), so you are buying new nipples. Same thing.
I probably had 10 - 14 bottles at one time. You have some pre-made in the fridge, some dirty, and some clean and ready to go.