Whether or not arrest records are made available online and at a cost is as the discretion of individual states. Also, while arrest records are generally matters of public record unless the investigation is still active, some states place limitations on the information that may be obtained from them.
In general, matters of personal identification information, such as Social Security numbers, are not made available to the public. Arrest records are also not made public, online or otherwise, for people who have had their records expunged. Access to arrest records that contain sensitive information pertaining to a case may also be restricted.