Marks sales prices

• Puts a sale sticker on, perhaps
• Puts a new price on
• Puts new prices on
• Changes the price of, as at the supermarket
• Marks up or down, say
• Puts a sale price on, maybe
• Marks up, say
• Corrects, as an ID on Facebook
• Labels anew

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: retag )