Where to buy a tray for rolling joints

I looked at several stores, but for some reason it seems to me that the prices for these trays are too high. I want to find something more budget friendly.

What are these trays for? To be honest, I don't really understand it.

Well, you know, sometimes when you roll a joint, some of the weed can spill, and you have to spend time and energy cleaning it up. Moreover, it is rather problematic to remove it from some surfaces such as a sofa. You can buy rolling tray , with which you can roll the joints cleanly and quickly and without any consequences.