Value please? C3PO error card, Bantha Tracks, Micro Machines help appreciated

Hello scummers ....

Could someone please tell me the value of a couple of things.

Firstly, "that" C3PO boner card ?

8 issues of Bantha Tracks (editions 17 to 24, Revenge featured in a couple of them) - fairly old and a bit yellow but still nice to have.

1984 official fan club merch brochure - greyed with age but still nice.

Are the Micro Machines sets becoming collectable now? I have 1996 set " II STAR WARS " which has landspeeder, crawler & falcon in it.

Thanks .