Don't feel like waiting for a free iPhone 4 bumper case from Apple? Here are three alternatives that you can buy now.

Speck Products Fitted Case for iPhone 4
A stylish option, Speck's case has a hard-shell coated with matte, soft-touch coating. The back of the case is wrapped in fabric available in several color and style options, including black and white houndstooth, camouflage, and lavender argyle (shown at left). The case offers access to all buttons, controls, sensors, and connections. Speck plans to release a protective screen film for the iPhone 4 soon. Cost: $29.95

Case-mate iPhone 4 ID Credit Card Case
This multi-tasking case has a slot on the back that fits two credit cards, IDs, or cash. The case, which is made from impact-resistant, flexible plastic, offers access to all ports and controls. It comes with a screen protection kit and is available in black or silver. Cost: $34.99

Otterbox iPhone 4 Defender Series Case
The Defender has a clear protective screen membrane and a polycarbonate shell covered with silicone skin. It offers access to the sync/charge port via silicone plugs and access to all side button features. The case, which is available in black, comes with a belt clip holster. Cost: $49.95