Best way to get A3 copies of sketch pages

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I need to draw comic pages on A3 paper, but I want to draw with normal pencils and ink on a copy instead of on top of them
My idea is to draw them first, scan them at a store, turn the whole thing blue, print them on A3 and ink them, then scan them again
The problem is that I would have to use at least twice the amount of A3 papers, pay for the pages to be scanned twice and pay for them to be printed in color on A3 which would cost me around £1,50 per page
does anyone have any advice on a better way to do this? It's a bit expensive
I could save money by drawing on A4 but I want to do A3
I could also ink digitally but I really want to ink manually