Hi there, I only use the Olfa seal healing mats & if used correctly ...they don't need replacing after many years. The first one I ever had I didn't know how to properly use a rotary cutter & held it slanted so in the end, cut little channels in my mat. The one I'm using now is like new after many quilts. The old one hides under the bed & I bring it out when cutting fleece or batting so that the newer one doesn't get such hard wear. I have seen people take their old boards & cut out the "good" patches to use for smaller boards for taking to classes or whatever.