[adverb] -er, -estI bought some chairs in the market which were going cheap (= they were not expensive).If you say that something does not come cheap, you mean that it is of good quality and is therefore expensive.I'm a well-qualified accountant, so my services don't come cheap.
CHEAP
Meaning of CHEAP in English
Cambridge English vocab. Кембриджский английский словарь. 2012