The Tweet Your Receipt campaign is an off-trade initiative designed to boost sales in the build-up to Christmas.
Anyone that buys a four-pack of Budvar 33cl bottles should take a picture of the receipt, log log into Twitter and tweet it to @TweetUrReceipt.
The entry will go into a draw for cash prizes of £250 and other prizes including a year’s supply of Budvar.
Participants chosen as one of the random winners are mentioned in a tweet by @TweetUrReceipt and are also sent a private direct message.
Ian Moss, Budvar’s marketing controller, said: “Tweet Your Receipt is a wonderful consumer motivator because participation involves our target audience in using the familiar tools and social media platforms they communicate with all the time.”