Just chiming in to agree. The Costco variety multipack is cheaper and have lasted me for years. Mine have darkened from use, but they're as effective as day one, no signs of fraying or cracking yet.
For anyone that hasn't tried silicone mats, I recommend them. Not only are they nonstick, but they seem to heat more evenly, I don't know the science behind it. With silicone mats I don't bother turning wings over anymore and they still get crispy all around and cookies don't get the slightly softer sticky center on the bottom. I don't bother with foil or paper anymore. I guess the only downside is it's one more thing to wash after cooking. But reusability is its own plus.