It varies. I carpetbombed every waterjet place I could find on google with a DXF of a victorian grille pattern, the original cast iron having partially rusted away; quite complicated to look at, but a lot of repeating twiddly bits. It measured 900mm by 50mm and I wanted it in 304 stainless, the quotes ranged from £120 up to an eyewatering £1800 with an average of about £400.
I had a batch of bits cut from 10mm alloy plate a few weeks back; there were 6 different parts with a total of 44 items and we got change from £250 inc. carriage but exc. VAT.