Today you can get your choice from over 178 DS games on sale 2 for $30 through Walmart’s Value of the Day. Not only will you score the games for $15 each but in this bundle you will receive a Merkury Innovations 16 Game Card Case. So you could look at this deal as being $10 per item.
Unfortunately this offer does not give you the option for shipping to the store. Shipping for me was $7.91. If you’re needing to mail a gift anyway than this would just save you that extra step.