Do a Gooogle search for tool repair.
For cheap Chinese tat badged up and sold through pile 'em high, sell 'em cheap stores, you'd probably pay more than the cost of a new one.
Screwfix have a "Titan" one for thirty quid and a Bosch one for 35.
Aldi and / or Lidl have them from time to time and B&Q do have budget stuff (Plus you can get 10% off on a Wednesday if you are a pensioner [or say you are] and have a Diamond club card)
Homebase (now becoming Bunnings in the UK) are also worth a look as the merchandising has changed with the new ownership.