When your domain name expires, you generally have 5 to 10 days to bring your billing up-to-date with your current registrar.
After this grace period, your domain name enters what is termed a "redemption period." During this time, no action can be taken on your domain name. In order to re-activate your domain, you must pay a fee to your current registrar. This fee typically ranges from $135 to $150.
If your domain name is currently in the redemption period, you should contact your current registrar for details.