Where can i buy an external CDR drive in the UK?

I have a friend looking for a cheap external CDR or CDRW drive for his laptop (Windows), i was wondering if anyone here could suggest somewhere to buy one cheap?

Thanks all :)

http://www1.novatech.co.uk/novatech/specpage/FRE-FX1

http://www.pcworld.co.uk/store/martprd.dll/store/pcw_page.jsp?BV_SessionID=@@@@0556737756.1032470069@@@@&BV_EngineID=cccfadcgfgjjfkkcefecfgmdffgdflh.0&page=Product&sku=643100


http://www.pcworld.co.uk/store/martprd.dll/store/pcw_page.jsp?BV_SessionID=@@@@0556737756.1032470069@@@@&BV_EngineID=cccfadcgfgjjfkkcefecfgmdffgdflh.0&page=Product&sku=651623