Assuming that the artwork to be printed is just simple basic line art, and assuming you just need a one color print, screen printing may be your best option. For arguments sake let's use the number 100 as the amount of sheets you need printed. Screen print pricing varies from state to state. I happen to live in the screen-printing and embroidery capital of the world (New Jersey) so my pricing may be a bit less expensive on average but these following numbers may help you make a decision.
- $1.10 per piece for the screen-printing (as a one color print).
- $.50 per piece for the additive that needs to be added to the ink so it will adhere to the polypropylene
- $25 one time screen/set up charge
TOTAL = $185
That should be a good guesstimate as to a general cost
As far as screen-printing is concerned, that job would be simple and should take no longer than two hours to make the screen, set up on press, and print the job.