Not quite the cheapness we occasionally get from Woot, but since they're not bundled there's no worry about superfluous volumes either.
XV includes The Robot vs. The Aztec Mummy, The Girl in Lover's Lane, Zombie Nightmare, and Racket Girls.
XVII includes The Crawling Eye, The Beatniks, The Final Sacrifice (Rowsdower!), and Blood Waters of Dr. Z.