retail has no recorded synonym. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is wholesale.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
be sold at the retail level
“These gems retail at thousands of dollars each”
Synonyms, antonyms and the broader and narrower relations for retail come from Princeton University’s WordNet. Full sources and licences.
at a retail price
“I'll sell it to you retail only”