FWIW -- Publix is my favorite place to liquidate MCs and also $500 cards in general. If you order, say, 4x $499 MOs, and use 4x $500 cards, the POS will autodrain each card. No need for human intervention, requesting split payment, etc. The relatively high MO fee is well worth it in terms of convenience, no hassle, etc., plus the clerks are almost always nice.