Motor Sich Airlines flies Antonov An-24 and Yakovlev Yak-40 aircraft on numerous Ukranian domestic flights. I flew them oneway from IEV to LWO for about $60 (last minute equipment swap from AN to Yak), it was a (positively!) memorable experience. Not many planes nowadays that you board through aft stairs.
https://flymotorsich.com/en/