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£13 including bike mount. Looks tidy enough. Only one left where I saw it so might have been around a while.
http://lidl.co.uk/cps/rde/xchg/SID-6159126A-26BCD879/lidl_uk/hs.xsl/index_32684.htm?offerdate=7510&ar2=3&id=90&country=GB&zipcode=DE21+4SY&city=Derbyshire&district=Derby&street=Mansfield+Road&ar=3&nf=True
had one for about 18 months. Can't figure out how the bike mount is supposed to work (doesnt fit any bars Ive had) but other than needing a new battery in the chest strap pretty quickly (bought a pair for pennies off ebay)and occasionally taking a while to settle down to accurate readings (possibly me not moistening it enough) its done everything its supposed to.
Dont know how cheap the equivalent branded HRM would be but cheap as chips and one of the Lidl punts that's paid off (their track pump was total bobbins, didnt shift air and the handle came off; to be fair Lidl refunded without question or explanation which gives me more faith in trying out some of their bargains again).