To earn the Ten Hundred Badge, you need to check in 1,000 times. Along with the new badge, these foursquare diehards are also privy to a 40% discount off anything in the foursquare store offer by way of a special discount code.
Earn the badge and you will see the following message:
Over 1000 check-ins!? Thank you 1000 times over! Treat yourself to 40% off some cool shirts at store.foursquare.com (using your unique code). We’d give you 1000% off, but that don’t make no sense! It’s a super tiny gesture of our immense appreciation.