The sale page says "Yen Press Manga", but light novels are included as well. I read a bit of KonoSuba and Empty Box and Zeroth Maria in Japanese before they had official English releases and thought they were pretty cool. Can’t comment on the English translations, though.
This puts a large number of these books at around $6 each, which is probably the best price I’ve seen for physical copies.
https://www.barnesandno