Our favourite Who blog (yep, even including this one!), Combom, has found an old advert for the Tardis Tuner, a classic piece of old Who merchandise.
I think this advert was also used in Doctor Who Weekly magazine, but will have to dig them out to check.
The Tardis Tuner was really a chunky black medium wave radio that also had flashing lights (the arrows on the front lit up) and sounds, and was manufactured by Shortman Trading in 1978.
There are some more photos on RichardWho.
There were a couple in good condition which had sold for just over 50 quid each on ebay a few years ago.