Frugal to the point of stinginess. (Merriam – Webster)
Not willing to spend money or to give or use a lot of something: (Cambridge Dictionary)
Someone who is parsimonious is very unwilling to spend money. (Collins Dictionary)
Very unwilling to spend money or use resources. (Oxford Dictionaries)
Considering Cost: Bloggers Reveal ‘Parsimonious’ Ponderings.
Parsimony in evolutionary theory: Law or methodological prescription?