You needn't got nuts spending money. If you're not going to use glass, you can just use spray mount to nail the print down on some foam core. Then trim the foam core to provide a suitable "mat".
What I do then is glue two small pieces of scrap wood of equal thickness on the back. The upper one is simply rested on a nail driven into the wall. By placing the upper wood scrap quite horizontally and centered, you can slide the print back and forth a little until it hangs straight. The lower wood scrap becomes a standoff, so the whole thing stands out from the wall by whatever thickness the wood scraps are.
For a different look, I first glue down decorative paper strips with torn edges, on the "mat" area and then glue the print down over that. This creates a pleasingly "rough" look to that faux mat.
Total cost for these systems is low single digits, and they're quite easy to build. Much easier than cutting mats.
Of course they're not designed for decades of use, but in this age of digital I figure I can just dash off a new print any time I like, so, whatever. If you're not using glass, I think you're already on that page?
Edit: you can also cut the foam core slightly smaller than the print, to float the bare print off the wall.