This Sat Nav is £64.99 in Argos, with good reviews.
£49.97 - but I bought the 4GB SD card (offer on which gives £2 off selected sat navs, RAC500 included), to bump it to £50.
Then add code: TDX-KMAW at checkout for an extra £10 off - offer ends 3rd April 2011
RAC500 - £49.97
SD CARD - £3.47
TDX-KMAW - MINUS £10
TOTAL: £43.44 with free delivery to store