14 Ill. Adm. Code 475.340
Lowest Prices - Guaranteed Lowest Prices
Section 475
Section 475.340 Lowest
Prices − Guaranteed Lowest Prices
It is an unfair or deceptive act
to advertise the terms "lowest prices," "guaranteed lowest
prices," "prices lower than anyone else", or words of similar
import, in the advertisement, unless the dealer systematically monitors and
continues to monitor competitive prices in the trade area and can substantiate
such claim.