Consumers have until Friday (March 26th) to sign up to Sky's services if they would like to receive a £50 Marks & Spencer (M&S) voucher.
The internet service provider is offering the coupon for the high street retailer to anyone who chooses to sign up to its broadband TV deals online.
After this week, the offer will revert back to its previous form by giving consumers an M&S voucher worth just £25.
Subscribers have access to a range of TV packages from Sky through the deal, while the firm is now also supplying its Sky+HD set-top box for free (with £30 standard set-up) without its high definition pack to those who register online.
The broadband bundle provider recently confirmed that its 3D TV service will launch in pubs and clubs across the UK on April 3rd.
Live coverage of the Premier League clash between Manchester United and Chelsea will be first content shown through the new channel.