Get used to 'skip diving' raw material is expensive, especially in small quantities.
When I had my workshop two things used to really tick me off - those folk who would turn up "Can you make me one of these?" Sure have you got the material? "No, I thought you'd have some" and "Can you make one of these but a bit bigger/smaller" "How much bigger/smaller?" "Well, you know, it just won't quite fit at this size". Not helpful!
I once made a very nice poker for a pal & gave it to him in the pub (I never charged mates, & rarely anyone else if they passed the attitude test) a complete stranger asked will you make one for me? Sure, I'd want £5 for materials and a half hour of whatever your hourly rate is; Oh, I'm not paying for it he replied. I didn't make the poker.
I made quite a bit of stuff for a steam loco restoration society, they always provided material & dimensions.