I think the main problem with the Alfine is going to be finding one...
Rosebikes have all the sizes and colours for under £50 http://www.rosebikes.co.uk/article/shimano-alfine-fc-s501-crankset/aid:670759
If you're on a mission to save money, get some of their house-branded Rodi rims while you're there :-) http://www.rosebikes.co.uk/article/xtreme-t-xp-19-28-atb-rim/aid:47595
55.45 with shipping, still cheap though.
@root started
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Rosebikes have all the sizes and colours for under £50
http://www.rosebikes.co.uk/article/shimano-alfine-fc-s501-crankset/aid:670759
If you're on a mission to save money, get some of their house-branded Rodi rims while you're there :-)
http://www.rosebikes.co.uk/article/xtreme-t-xp-19-28-atb-rim/aid:47595