RadioShack is to start selling Virgin Mobile’s no-contract iPhone 5 from today, according to a recent report from MacRumors.

One week ago, we told you that the carrier was planning on offering the iPhone 5 as a prepaid smartphone. The iDevice, we added, would be available for as little as $550, contract-free.

Now, MacRumors claims that RadioShack is to offer Virgin Mobile’s no-contract iPhone 5 from today. The website explains:

The entry-level 16-GB iPhone 5 will retail for $549.99, and customers with an eligible trade-in can receive $50 off the purchase price before July 27. RadioShack is also offering new discounts for Virgin Mobile’s iPhone 4 and 4S. The iPhone 4S retails for $400 while the iPhone 4 retails for $300.

RadioShack is introducing a $50 promotional discount on the older iPhones until July 6, which can be coupled with the $50 trade-in discount. That drops the price of a contract-free iPhone 4 to $200 with an eligible trade-in.

RadioShack is also offering both 32- and 64-GB iPhone 5 handsets for $649.99 and $749.99, respectively.

No-contract iPhone plans are also available from $35/month, or $30/month if customers sign up for automatic payments. Though customers are offered unlimited data on these plans, it should be noted that cellular download speeds are throttled to 256-Kbps after users have downloaded more than 2.5-GB.

A clarification from a Virgin Mobile spokesperson:

Please note that the 32 and 64GB versions of the iPhone 5 on Virgin Mobile:

• Will only be available online, not at retail
• Won’t be available online until next week

Interested? Head over to RadioShack today for more information on its Virgin Mobile iPhone 5 offerings.

For more of today’s news, see: Verizon’s 4G LTE Network Expansion Is “Substantially Complete”Glasshouse Apps Sold To Other Developers, Tweetglass Acquired By Tweetbot Creator, and Worried About Reeder After Google Reader’s Demise? Don’t Be.