Best Buy is currently running a sale on pre-paid game currency cards, including ones for the Xbox Store and Steam. Gamers can buy one pre-paid card and get the second one for 20% off.
The discounted card will be for the one that has an equal or lesser value that the first card in the bundle. So if you wanted to get, for example, two Xbox Store cards for $15 each, the second one would be priced at $12.
The sale isn't limited to Xbox and Steam. Best Buy is also including pre-paid cards for PlayStation, Nintendo, EA Origin, Blizzard, League of Legends and many more gaming services.