(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.)
Steam has the METAL SLUG Bundle on sale for 50% off as the daily deal for 9/14.
METAL SLUG Bundle $8 – includes:
METAL SLUG $4
METAL SLUG 3 $4
METAL SLUG X $4