Setting up product books for sales calls

So I want to start working on putting together product samples to bring with me on sales calls. (Roof colors, floor coverings, siding,windows, things of that nature)
Where do I go to obtain these things on a permanent basis. I know I can borrow them from a couple of my suppliers, but they generally want them back pretty quick, making it an extra drive to return them, not an issue if I sell the job, but if I don't its just an extra trip. Also, when those samples are already out with another contractor, I'm up the creek without a paddle.

Do I contact manufacturers directly and request my own samples? How much do they generally cost? (ballpark)
I cover a lot of trades, so I'm looking for the most cost effective way to acquire this info without breaking the bank.