I'm singlespeeding my road bike for the winter and I'm after a rear hub to build up into a wheel

Looking for the following attributes:

* mini cassette freehub body (to fit shimano hg type single cogs, rather than a screw-on)
* 120 mm spacing
* long axle so can be spaced out to 130mm (or replaceable axle at least)
* not too spendy (up to £50ish)

Have yet to find a hub which meets the above requirements. Does anyone know if such a thing exists?

Ta!

Shimano DX hub?

cheers – that was what I was thinking of and would be just the ticket (provided bmx 14mm axles will fit my frame) – but I can't find any anywhere!