Some benchmarks show the D9L cooling better than the U9S. Both coolers are rather subjective and basically the same, 1 degree hardly seems like a come up if it ends up surpassing it at all. The D9L also fits the ram next to the heat sync instead of directly squishing next to the fan. It's also $5-6 cheaper, though that makes no difference to me. I am simply hunting for the best air cooler money can buy but I've had really poor luck with it. I'll probably just go D9L because I don't want to cram a massive corsair aio in this case.
If I could find a Noctua C14 I would go that route, but haven't had any luck. I'm using the Z270i Strix board if anyone has cooling suggestions besides custom loop.
Memory Express in Edmonton Canada still shows 3 available; http://www.memoryexpress.com/Products/MX34316 I live in the US and was able to get it shipped for about $89.00 US. It took about a week to arrive.
Try using the contact us link. I posted the contact info back in December for the gentleman who helped me at Memory Express back then, try searching. They do ship to the US.