Permanent accounts go on sale from 00:00 Eastern Standard Time June 8th, and remain on sale for the following 24 hours. They will cost USD150, include all the features of paid accounts, but they will have 100 userpics. Paid accounts will later have the opportunity to buy themselves up to 100 userpics, as well, but for now it's only on permanent accounts.
If you have a paid account, and upgrade to a permanent account, the remaining paid time can be transferred to a different account.
In addition to credit card, they accept money orders, check, and cash, with restrictions as detailed in the official announcement at news.