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Plastic, plastic with metal pins, or metal (painted or ano)?
http://www.chainreactioncycles.com/pedals/bmx-pedals?f=4294967167,2247&sort=pricelow
http://www.chainreactioncycles.com/pedals/flat-pedals?f=4294967167,2247&sort=pricelowAt the low end, you'll want easy returns in case you get a pair with shitty bearings.
Otherwise, you can get Shimano Saint MX80 (graphite-ano/raw) with replacable pins (come with optional washers for pin length) for about £25 on eBay.
Any recommendations on black platform pedals please guys?