I have been using an x-acto self healing cutting mat for over 20 years. It has grids on it that where the lines are in different sizes making it easy to get things square.
I wound up spilling some MEK on it and most of the lines are now gone. I went looking for a replacement but apparently they don’t make the one I have anymore.
I used the Alvin 36x60 and 36x72 as drafting mats at one time - I understand they are no longer made but some sizes are still available. At one time I had the big translucent version on the Hamilton lighted-top table but I only used it part of the time as the drafting machine didn’t like rolling over the edge.
They worked fine for typical trimming, paste up, and foam/card architectural modelmaking.
I always used a mat on a good flat surface, so I don’t know anything about self-healing on irregular surfaces or bumps, which some ‘craft’ mats are supposed to be able to do. I’m sure others here will know firsthand.
The one I have is Tech Tools. It seems like other sellers they change brands, the last one was a different manufacturer but both are very good quality.
I go for the 40% off and I’ve never had a bad cutting mat from Hobby Lobby.
For reasons I don’t recall, I picked the following Dahle 12" x 18" on Amazon (free Prime shipping) a couple of years ago. It fits nicely atop the larger desk calandar blotter I use on my desk. Just the right size for me. I usually cut against the cardboard back of an 8-1/2 x 11 tablet, so I can’t attest to how good the healing properties are.
Years ago, i bought a small cutting mat from an artists’ supply store, and recently got a larger one from Princess Auto at a good price. They seem to last a long time, probably because I don’t often have need of them.
Cutting of styrene sheet is score-and-snap, and cutting of styrene strip and shapes is done either on a NWSL “Chopper” or with an X-Acto on my glass work surface.
All decal cutting is done on glass, too, as it makes for very precise cuts.
I like to use the 12" x 18" X-acto self-healing mats as well (plus I have an unused one that is on standby when the current mat finally goes). My LHS still sells these same self-healing mats ( I saw a couple when I visited them last Friday, Nov 20), and I see that Staples.com has these listed on their website (see their SKU #609016) so you can give that a try.
The one I have has grid lines spaced 1/16" apart with the 1/2" lines bolder. Before I accumulated a variety of tools I used it heavily for cutting, but more recently it has been used for squaring up and measuring. I think I am just going to keep using what I have for the occasional cutting and get a glueing jig and a duplicatling jig. Projects will turn out better that way.
I will agree with looking at fabrics and crafts stores if worse comes. The quilting mats are designed to handle rotary cutters which are as sharp as hobby knives.