You could try, the coloradoan, but most likely that won't do much for you. Then up on the Northeast side of town off of Mulberry there are a lot of mechanics and what not, you could always try putting up a for sale flyer there. I had all my work done at Gooding Performance on Lincoln Lane, across Mulberry from Fort Fun. Talk to Randy and see if he might let you put something up there. Then last case would be like Auto Accesories there on Horsetooth or even PFI(if it is still in existence) out South College by the Tynans.
Your best bet though might be the Denver paper, that is where my family and I find the best luck with cars. I thought you were thinking about selling the Maxima not the tour?