Amazon offers Prime members Frankenstein: Complete Legacy Collection on Blu-ray for $19.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $4.88.) That's the lowest total price we could find by $8.

Also available is The Wolf Man: Complete Legacy Collection on Blu-ray for $19.99 with the above shipping options. That's the lowest total price we could find by $6.