Get in touch with Davida or one of their distributors as they manufacture this type of helmet. However, they are not legal to wear on the public highway in the UK, so beware. The cost varies on the design and should be between £100/150. Alternatively, you may be lucky and find one at a classic autojumble. I found a small 1950's helmet at Cheltenham earlier this year and paid £20 for it! Good hunting