Not a supermarket, but Dabs.com have a DVD player at £58 online, not got them in stock for a couple of days though yet. The brand is Dabsvalue so not so sure about the quality, but I'm looking for Christmas presents, so after a cheap one for mum + Dad!
Lidl stores are currently doing a weekly special on a Supervision 2550 dvd player which is advailable in silver and black and according to the box plays Mp3 and supports DTS as well as having Dolby digital decoding and seperated line outputs and component video connections, all for £69.00
Don't know if it's multi-region though although most cheap players are.
Just bought the Cyberhome 402 for a Christmas present, can play everything and had won the group test in one of the Home Cinema mags out this month. Also does a slideshow of JPG pics from a CDR handy for those with digi cameras. £79.99 from Whsmith.
Alternatively, TJ Hughes has an LG DVD Player with a leaflet to send off for 3 dvd's free and that's £89.99 (it was £79.99 but TJ Hughes' sale has just ended....just in time for Christmas!). The model is a 5183.