Amazon.com has the Metal Slug Anthology for the Wii for $20 shipped.

Overview - Metal Slug Anthology is the definitive collection of the intense shooter series. It includes all six of the classic games, all on one disc - with ammunition and firepower than ever before. You’ve got an incredible arsenal waiting for you, from destructive pistols & combat vehicles to a stockpile of grenades. Players’ enemy-killing capabilities are upped to off more evil-doers in this 10th anniversary edition of an arcade classic. Includes Metal Slug, Metal Slug 2, Metal Slug X, Metal Slug 3, Metal Slug 4 and Metal Slug 5.

Use One-click Checkout to buy this product, and receive $5 in free MP3’s from Amazon.com. Click here for full details.