newegg offers the refurbished, no-contract Apple iPhone 4 8GB Smartphone for Sprint in Black, model no. MD146LL/A, for $199.99 with free shipping. It's the second-best price we've seen for a Sprint iPhone 4 without a contract. (We saw a refurb for $5 less a month ago.) It features an Apple A4 processor, 326-ppi (pixel per inch) Retina 3.5" display running at 960x640, gyroscope, front- and rear-facing cameras, 5-megapixel camera with LED flash, 720p video capture at 30 fps, 802.11n wireless networking, dual microphones, and more.

Of note, a 90-day warranty is provided but it's unclear who backs it.