Some fantastic deals on Fokker 100 platform, I know of a operation whom purchased 4, at 1.6 Million each they put long range tanks in, along with new paint and corporate interior, fantastic AC with stage 3 compliance and EASA certified.
The build-up cost for F100 wouldn't be very low, reaonable VIP interior alone will ask for $5m+. Aircraft originally built as an airliner tend to be quite expensive to run on a low utilization. F100, B737, MD87, BAE146 etc could be allright when you regularily need to carry 16+ persons and have a descent amount of flying. When they stay on the ground they eating money very fast. There are a few 737-200 HKIII on the market, low time, fancy golden sink etc for less than $10m (737 VIP interior costs anything between $8m to $20m alone), even more cheaper 727s but there are no takers, you may wonder why...