As a couple, our first toys were bought together. A load of bondage gear (suspension cuffs, normal cuffs, crop, gag etc) if my memory serves me correctly - says a lot for the focus of our first few months together!
Since then, most things are at least jointly decided upon even if one of us actually does the ordering.
My first ever toy was bought by me but it was recommended by my then partner. I got a rabbit as he knew several girls that had them and thought they were wonderful so it seemed like a safe first toy to buy. I was pretty pleased by it :)