Bought my first game in 1988 from a Trading Post ad. $ 200 Bally Flip Flop.
Got into the DMD's in 2000. Found a sample TZ from a Cincinnati operator and paid $ 2,000 (with tax). Bought from a Louisville and Columbus operator and prices were 2000 for CV, 1800 CFTBL, 1900 TOM, 2000 TOTAN, 2200 RFM. AFM was 2600 but did not buy. Sold these all off by 2003.
Got back in 2007-08 and prices were up to 3900 TZ and 3500 for a sample CV. Sold off again by 2010.
Current prices have doubled again