PC World will give a free or discounted laptop to every customer that signs up to an 18-month mobile broadband subscription from 3.
Customers can choose an Advent laptop from a list of more than 10 "highly specified laptops" and get a discount equivalent to up to £350.
Customers who sign up to the agreement pay £35 a month for their tariff and are tied in for 18 months.
They get a 3GB per month download allowance. Excess data is charged at 10p per MB thereafter. Customers also get 200 included texts within the £35 per month tariff.
Carphone Warehouse and 3 run a similar 'free laptop' promotion. In that case customers get a free Dell Inspiron 1520 if they sign up to the mobile broadband tariff.