 Finally the Sol-20 added a keyboard with numeric keypad, and a larger power supply to feed the five expansion slots and a fan to cool them, for $995 as a kit or $1,495 assembled.Advertising of the time referred to the Sol-20 as "The first complete small computer under $1,000".Most systems would require additional pieces, which they bundled as the "Sol Systems"; the Sol System I consisted of a Sol-20, an 8k RAM card, a PT-872 monitor and the RQ-413 Cassette Recorder, for $2,129.