GMAT Strategy

I'd like to simulate taking the GMAT under official conditions and understand that the testing centers provide erasable whiteboards instead of pencil and paper -- yes?

Are these writing instruments standard for all gmat test-takers? What are they like?

Could anyone provide a link to a whiteboard/marker product sold online similar to the one provided at the test? (or can I get something close-enough at CVS/Walmart/Target?)

Thanks! (and apologies if this is covered elsewhere in the forum -- I did a search but didn't see it)