RadioShack quietly announced on Monday that it is now offering AT&T’s Inspire 4G for just $29.99 with a two-year contract for new AT&T customers and existing subscribers looking to upgrade. Though the Inspire is still a relatively young device that was just released in February, newer dual-core smartphones are already making it look a tad gray up top. Its specs are still respectable, however, and they include a 4.3-inch display, a 1GHz Snapdragon processor, Android 2.2 (Froyo), an 8-megapixel camera, 768MB of RAM, 4GB of storage and HTC’s Sense UI. RadioShack’s price is the lowest we’ve seen from a reputable retailer, and it’s good from now through May 21st.