Buying second hand due to financial difficulties

I'm really having a hard time financially. With my first I spent a huge amount of money buying everything brand new and unfortunately I gave everything away to my sister. I don't want them back, she recently had a baby and she is doing great financially but anyways, I consider everything gone. Recently I came across this Facebook group where parents sells they used baby gear for a fraction of the cost of new stuff. Yesterday I bought a travel system that retails for $400 brand new and I only paid $150. I washed everything with purex and wiped every single plastic with sanitizing wipes, but then my husband made me feel like I made a mistake buying second hand and now I'm having seconds thoughts about using it with my baby. He told me I can totally buy a $50 carseat and then a $80 stroller, both brand new.