Latin tutorial: https://www.youtube.com/watch?v=Y69cLzFHVUs
The price of something is expressed in the ablative, the price either being a specific numerical value or referring to a general amount (e.g. high or low price) or, as in the last quotation a noun which is equated to a value.
Agrum vēndidit sēstertium sex mīlibus. │ He sold the land for 6000 sesterces.
Nam nummōs antīquōs magnō pretiō vēnumdant. │ For they offer the ancient coins for sale at a great / high price.
magnō pretiō: at a high price
parvō pretiō: at a low price
sānē [i] magnō pretiō, [ii] nummīs aureīs quadringentīs (Livy) │ of course [i] at a great price, [ii] for four hundred gold coins
operam Epidicī nunc mē emere pretiō pretiōsō velim (Plautus) │ I'd be willing to pay a pretty price for Epidicus's assistance now [literally: I would like to buy Epidicus’ assistance at an expensive price]
Antōnius rēgna addīxit pecūniā. │Antony sold kingdoms for money.
Logōs rīdiculōs: quis cēnā poscit? │ Jokes: who wants them for (at the price of) a dinner?
