I know they are worth a decent amount if in good shape, but still, on ebay they can be had for pretty cheap:
http://cgi.ebay.com/Penn-Senator-112...4#ht_804wt_960
http://cgi.ebay.com/Vintage-Penn-3-0...0#ht_500wt_976
Really not sure about the 68's - bought a 66 at tri-state last year for $25, but it was in really good condition (missing a handle though, but I had one for it).