In all seriousness, no clue. 3m makes so many different materials that range from .50/ft to 4/ft, acm costs are all over the place depending if you want paint on it, face stock thickness, then you have quantity breaks at that quantity.
Find a supplier, get a quote for 50 sheets. Also price 4 rolls of your preferred 3m, ij35c is fine for this, better options definitely exist, and settle on a laminate, I pair arlon 3420 satin with my 35c. Add all these materials together and multiply by 1.5-2.5. Then figure how long it'll take to print, laminate, trim, apply, and pack/deliver. Multiply the time by your shop rate, add in your materials, and roll with it!