Hilarystone is selling some old BMX bits atmo. pedals, 2-finger brake levers.
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Of polo interest might be the layback seatposts (22.2mm but you can shim) for £10 or less:
Could be a good chance to grab a 20T Shimano DX cog for a 5er with spacers for another £6.. Add these parts to some random shimano cassette rear wheel, and you can have a 20T freewheel setup. if you wanted one.
Hilarystone is selling some old BMX bits atmo. pedals, 2-finger brake levers.
THread Link
Of polo interest might be the layback seatposts (22.2mm but you can shim) for £10 or less: