I only downloaded from Walmart once, to get something that wasn't available anywhere else. Here's the email I got from them when they discontinued their MP3 service:
Dear Walmart Shopper,
As a valued music download customer at Walmart.com, we're writing to inform you that we'll no longer offer this service as of August 29, 2011.
You will still be able to enjoy the digital music you purchased and downloaded from Walmart.com. Your complete purchase history and the ability to authorize/deauthorize any DRM-protected WMA files you may have purchased is currently available until August 29 at
http://mp3.walmart.com and, after we close the service, will be available again beginning September 12. Any MP3 files you purchased from Walmart can be moved to multiple new computers, as usual.
If you have credit left on an MP3 Music Gift Card that you've used in the past, we will send a Walmart eGift Card of equal value to this email address automatically. No action is required on your part to receive this eGift card, which will be sent to you by September 12.
If you have an MP3 Music Gift Card that you haven't used, we will provide you a chance to convert them. Please visit
http://mp3.walmart.com on or after September 12 to redeem your current gift card for a Walmart.com eGift Card of equal value, which can be used as cash to purchase any available items from Walmart.com.
For more information about how to use the music files you've purchased, or to ask any other questions about this service, please contact our customer service team at: musicdownloads@walmart.com.
We appreciate your continued business with Walmart.com and look forward to serving you in the future.
Sincerely,
Your Walmart.com Customer Service Team
http://www.walmart.com