If you search for BZK towlettes, you'll find lots of things that seem to be comparable to the Hygea wipes. I haven't used those particular ones, but they seem to be similar to lots of other ones. Dynarex 1303 look similar and are widely available - Amazon has them in cases of 1,000 for about $50 or boxes of 100 for about $13.
I've been looking for smaller BZK prep pads to use instead of the big 5x7" ones, but I haven't found them yet.