Conservatives will launch a loyalty card allowing supporters to claim discounts in high street shops.
The scheme, launched fully next month, is the brainchild of Tory Chair Caroline Spelman, MP for Meriden.
It is part of a recruitment campaign launched this week allowing members of the public to become "friends" of the party for as little as £1.
The Tory campaign, using the slogan "You can get it if you really want", is being promoted with webpages on sites such as MySpace, Bebo and iVillage, as well as billboard posters and newspaper adverts.
Mrs Spelman was in Birmingham yesterday, with Shadow International Development Secretary Andrew Mitchell (Con Sutton Coldfield) and Tory General Election candidates, for the drive's West Midlands launch.
The card will be launched as part of the next phase, when direct mail will be sent to thousands.
The party is not revealing which retailers are taking part, but the card will allow "friends" to earn points and discounts.
Mrs Spelman, responsible for managing party machinery, said the aim was to create a way for people to support the party even if they did not want to be full members.
She said: "We recognise it is not fashionable these days to join a party, but a lot of people are sympathetic. We are encouraging them to become friends. It is the first step to declaring your support without going the whole hog.
"Members still get certain benefits, such as the ability to vote for the leader of the party or choose candidates.
"Friends get regular mailings, and we have learnt a thing or two from the private sector and created our affinity card.
"We are still working on details, but it will be launched in March as part of the direct mailing."
The Conservatives hoped to capitalise on their strong standing in opinion polls, Mrs Spelman said. A poll this week put the Tories on 41 per cent of the vote, 11 points ahead of Labour.
She said: "I have been wanting to do a recruitment drive for some time, and obviously the time to do it is when you are ahead in the polls.
"I really like the posters, they are positive and upbeat. I felt some of our publicity in the past was a bit negative.
"They will be followed by direct mailing so people who have seen the posters or newspaper adverts can learn more.
The campaign is costing about £500,000, but the party hopes to recoup the money and more through donations.
People who sign up as friends will be free to pay however much they wish.
The cost of full membership is £25 a year. Labour charges members between £12 and £120, depending on income.
The Liberal Democrats have a recommended fee of £48, although members can pay less, with a minimum of £10.
David Cameron, Conservative leader, said the idea of allowing people to choose their own fee was inspired by the band Radiohead, which made an album available for fans to download in return for whatever they thought it was worth.
The campaign has been boosted by a contribution from award-winning film director Matthew Vaughn.
Mr Vaughn, whose credits include Layer Cake and who produced Lock, Stock And Two Smoking Barrels, directed a video on the Internet.
The film features Mr Cameron in his Commons office, telling voters: "The world is changing and my generation of politicians understands that.
"A decade ago, the internet was just a buzz word; now it is changing the way we live our lives."