WD 5TB My Passport for Mac Portable External Hard Drive (Blue, USB-C/USB-A) – $113.99(Prime members)/$119.99 – ATL

$113.99 for Prime members and $119.99 for non members. ATL either way as camelcamel lists lowest as $127.49.

AFAIK, this can be used for Windows machines as well as long as you reformat it first.