Saurik disabled purchases in the Cydia Store on Thursday in an effort to protect users from a bug that could result in arbitrary PayPal purchases. You can still buy jailbreak tweaks from third-party repositories, however.
Those who are deeply involved with the jailbreak community are likely to know a lot about Flex, a platform that allows users to download patches and modifications to their jailbroken iPhones or iPads. They can create and then share their own patches with the rest of the Flex community so everyone else can enjoy the features as well.
An early access version of Flex 3 has now launched in Cydia’s BigBoss repository, giving public availability of the platform to everyone who owns a jailbroken device.