(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
GOG has an Active Media Gem Promo up. Buy all the games at once for a 77% discount. Buy them individually for 60% off.
La-Mulana $3.41 / $5.99
Astebred $3.41 / $5.99
Mitsurugi Kamui Hikae $2.27 / $3.99
Unholy Heights $0.90 / $1.59