Yes, she wrote Best buy.

You can try doing a search on Google for his computer's make, model, and year and parts (or then try accessories). Then look for the adapter that way.

I'm sure that you know the make and model of the computer, but I don't know where to find the year of a PC tho. I am a Mac person. But maybe someone else can help with that...
But you may not even need the year if there are good pictures or a date range for which years the part is compatible with.