Debb, to learn about the other Pentax equipment, try doing a search on each item separately, using the search button at the top of each Forum page. Another Forum source of information about the market value of a particular Pentax item is the Marketplace; find your items in the posts and follow the threads to look for asking/selling prices.
As for Konica gear, get thee to Google and search for Konica, Konica Minolta, and (lately) Sony user groups.
Oh, and I hear that there's this thing on the interTubes called "fleaBay" or some such newfangled nonsense...