(I hadn't heard of Gigaparts before but a quick search showed good ratings and reviews)
This is a solid kit at fast speeds that appears to support Ryzen, per the Amazon reviews. [amazon.com]
This seemed a lukewarm deal at first, but it ended up being cheaper than the most recent previous sold out deal
for me (a Californian) since there was no sales tax. And with DDR4 RAM prices these days, you're hard pressed to find a decent kit at this price anywhere, with or without tax.