I like collecting the vintage stuff from the first two movies. I have the original 35mm film of Halloween and well as the 35mm trailers for Halloween 1 & 2. TV ad spots for Halloween in 16mm. Halloween & Halloween II in the original Media Home Video/MCA cases, Halloween II on CED disc, Criterion Collection Laserdisc, LP soundtrack etc.
I also went to the library where they have mirco-film of every local newspaper ever printed and was able to find an original ad for Halloween in Jan 1979.