Like all quoting, break it down into as small a pieces as you can, then add them all together, and there’s your price.
In this case, crudely, how much print will it take, at what price to you? Add in a profit margin and however long you think it will take times your hourly labour rate. That will give you your price. Simples.
That your price may be more or less than anyone else’s is neither here nor there. Your overheads may be more or less than others, but that doesn’t matter, it’s your costs that are important, and which will dictate your profit.
Work your own price, then, if you win the job you will make money. If you lose it because you are too expensive, then what does it matter? You weren’t going to make any money anyway.