Thin sleeve for MBA available in Australia?

I’m looking for suggestions for a thin sleeve for my M3 MacBook Air, something like the Radtech Radsleevz (I have had their Screensavrz in years gone by) which is available here — postage is almost as much as the sleeve

After something to prevent scratches and rubbing

Could be zipper less neoprene one (I lost the link to one which is open on one side, stretches over the corners. The laptop pocket in my bag is not larger, which limits options, so a max 32cm width (long edge).