WordNet (r) 3.0 (2006):

price tag
    n 1: a tag showing the price of the article it is attached to

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "price tag":
   amount, billhead, book stamp, bookplate, brand, broad arrow,
   cachet, charge, check, colophon, cost, counterfoil, countermark,
   damage, docket, expenditure, expense, figure, government mark,
   government stamp, hallmark, imprint, label, letterhead, logo,
   logotype, masthead, plate, price, rate, registered trademark,
   running head, running title, score, seal, sigil, signet, stamp,
   sticker, stub, tab, tag, tally, tariff, ticket, title page, token,
   trade name, trademark, trademark name