Hi Calvin, VGA y cables don't always work and when they do they are not very reliable as there is 2 way communication from the monitor to the PC, I dont know if they have a Y in stock but they will have video cards and different adapters to get a proper 2nd or 3rd vga output that you can have windows duplicate or span.
I would say if it was old store without a doubt. That last 5 or 6 things I've needed and went there for they don't stock anymore but can order it. Honestly if it needs ordered I might as well order myself. Probably cheaper anyway that way.
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