Bought it at bol.com: https://www.bol.com/nl/nl/p/tp-link-archer-t4u-wifi-adapter/9200000012841709/?referrer=socialshare_pdp_www
I’ll post my findings on the other thread that addresses the problem with the T4U: https://community.roonlabs.com/t/wi-fi-tp-link-t4u-does-not-work/174293