I presume you are asking if there is an alternative to buying the Garmin TOPO! US 24k Southwest dvd mapset which includes all of Colorado plus several other states($129 retail, $90 from Amazon).
You might try http://www.gpsfiledepot.com/maps/state/co. Although if you are not an experienced user, you might find this not worth the savings, as the maps may not have all the info you expect.
