Just spent a lot of time researching this. Went to D.I.D had none, harvey normans the same. Lots in Argos & also Halfords.
Was thinking of the phillips duo for the car €239 in Argos, Halfords also had Next base duo €289 (a bit dear for me) so was gonna buy the phillips. Did some research on Amazon.co.uk & phillips got slated. Managed to buy the next base duo that was in Halfords for 118 Sterling! Bargain!!! (It got really great reviews on Amazon) It arrived last thursday, have since gone from Drogheda to Cork & back…. so much less hassle 😀
You can also use rechargable batteries & there is a plug & lead for use in house