Brightsolids a division of findmypast.com has launched its website as pay-as-you-go. Census records from1790 to 1930 are accessible by the month, 6 month or a full year. The subscriptions are very reasonable starting at 12.95 for a month for a to a full years access at $34.95 unlimited. Remember however, it is census records only. You can visit the site at:
http://www.censusrecords.com/