Here is a recommended product: http://dx.com/p/117175Specifications:
Dimensions: 7.83 in x 5.04 in x 0.63 in (19.9 cm x 12.8 cm x 1.6 cm)
Weight: 16.58 oz (470 g)
* 1-Year Manufacturer's Warranty: this warranty is offered directly by the manufacturer. Should the item become defective within the manufacturer's warranty period (physical damages and damages caused by incorrect usage excluded), customers may send the unit back to DX's Hong Kong office. DX will help forwarding the item to the manufacturer for repair or replacement, and will look after the progress. The customer will need to cover shipping fees both ways.