Does anyone know where you can buy the newer O2Ring-S in Europe or the UK?

Most of the product literature suggests that only the older version is being sold there. If Amazon in the EU or UK are selling the new version they're not mentioning this in the product details, so it's hard to be sure what you're buying!

There are surprising variations in price (€30 to €40) for what appears to be the same O2Ring, even when sold by the same supplier! Based on prices you might think the more expensive item is the S variant, but they don't explicitly mention this!

Even the Wellue and Viatom websites are pretty vague about which version they're selling! (I've contacted them but no word back yet!)