It does make sense, if you think in English first.
To stay home = no salir de casa (quedarse)
To have a date with someone = salir en/tener una cita con alguien
To buy something = comprar algo
There is = haber/hay
Now, you normally would say something like the question "I like a lot this skirt. I am going to..... = Me gusta mucho esta falda. La voy a....." not in your home, not when on a date, not asking if there is. You are looking at a skirt that you like in a store, and you go there to buy.
Does this breakdown help you see why "comprar algo" fits there?
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