Sky hopes the lure of a £100 Marks & Spencer voucher will encourage households to switch to its unlimited ADSL and fibre broadband deals.
For a limited time, the service provider is offering free M&S gift certificates for new customers taking out a Sky broadband package for the first time.
The vouchers can be used at M&S stores across the UK, allowing consumers to make significant savings on their shopping.
Sky is offering free £100 vouchers with two broadband deals - Sky Unlimited Broadband & Calls and Sky Fibre Unlimited without TV.
The first package is aimed at households seeking ADSL broadband services and calls. It offers up to 20Mb download speeds, with 16Mb speeds typical for most users.
Subscribers can take advantage of an unlimited monthly usage allowance and inclusive weekend calls to UK landlines.
A free Sky Hub wireless router, unlimited access to Wi-Fi Hotspots from The Cloud, and Sky Shield - which offers parental controls and an anti-malware solution - is also included with the package.
At present, new customers can pay just £5 per month plus line rental for the first 12 months, rising to £10 per month plus line rental thereafter.
Sky Fibre Unlimited without TV is aimed at households wanting super-fast broadband speeds and home phone calls, but without a satellite television subscription.
The package offers typical download speeds of up to 38Mb, an unlimited usage allowance, inclusive weekend calls and a free Sky Hub router.
Unlimited Wi-Fi minutes and Sky Shield are again included with the deal.
This super-fast broadband package is priced at £10 per month plus line rental for the first six months, rising to £20 per month plus line rental thereafter.