The Prodigy Services Co joint venture of IBM Corp and Sears, Roebuck & Co reckons it now has 900,000 subscribers to its US viewdata service for personal computer users, and believes it is time to add some premium services such as a share picking and tracking service at $15 a month on top of the $10 a month basic charge; it is also offering a Baseball Manager game with make believe leagues, which will cost $120 a season for participation.