There is now a WePay set up for sending funds to Weev’s prison account. He can use the money to purchase items from the prison’s commissary. The fund was set up by Weev’s lawyer, Tor Ekeland. You can contribute to it over on (WePay).
UPDATE: We are unsure, but currently we believe that the prison may have frozen weev’s access to his commisary account. We’re looking into it.
UPDATE: Weev has asked that people stop funding his commissary account because he has been denied access to the funds. (source)