Buy from Amazon : http://www.amazon.com/gp/product/B003EWKPSI?tag=scratchandsti-20

Fotodiox Pro Studio Solutions EZ-Pro 48 Octagon Softbox with Speedring for Bowens Gemini Standard/

Pro-grade heat-resistant fabric
Constructed with premium-grade material
Features an inner baffle and outer diffusive cover for an even light throw with sealable venting for high-powered lamp or continuous lighting
Includes a rotating speedring that is specifically designed for your flash or speedlight to fit standard softboxes
Includes a 24 Month Manufacturer Warranty