In the unironic way. I expected it to exist in some form, but being this formalized? wow.
Anyway it’s apparently still a thing https://inspirationalwomenseries.com/mail-order-bride-sites/ 
And you used to be able to get them from Ukraine! https://www.imdb.com/title/tt3249478/
I was there at the time (the 90s). It was a very common “joke” and no one ever made the connection that hey, that’s weird how we just destroyed the Soviet economy and now all these women from the former USSR are available to be purchased…