Sorry for the bad picture, blame my phone!
Saw/Bought this in Toys R Us today (Lakeside)...
It's called Power Play by Playvision, was only £2.99 and thats not a sale price. It has 49 games built in, all seem to be NES clones (track and field etc). Comes with 2 controllers and AC adapter and TV leads, can also take batteries.
They have loads in stock and dont see why other Toys R Us wont have them. Not on website tho.
Good value and good stocking filler.
For those retro fans it appears to have a famicom port on the back (i have bought a similar one before that also did), and the second controller connects by a (old) standard joystick port so make take megadrive pads etc