To the best of my knowledge, this is sonnet's official site:
https://www.sonnetstore.com/collections/computer-cards/products/allegro-usb-3-0-pcie-4-port
Somebody please confirm, because i'm not 100% sure. I got mine for $50 from amazon a month ago, that new price is cray.
EDIT: actually, here's the amazon link to the sonnet card i got:
https://www.amazon.com/gp/product/B00GRGCV2G/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1