Another word would be economic.
Thrifty
least expensivemost economical
Low-cost.
"economical" has no comparative or superlative form. You would say "more economical" or "most economical."
I wish you weren't so economical with the truth.
uneconomical, profligate
economical stingy
Some synonyms for the adjective 'economical' include: avaricious, canny, chary, circumspect, close, closefisted, efficient, frugal, prudent, and meager.
Economical
In the sense of "careful with money," that might be "economical."
A word with 7 syllables such as an-ti-dis-crim-in-a-tion i.e. to be opposed to discrimination
thrifty, conservative, cheap, price-sensitive, economical