land is extremely expensive (in that area) (idiom)
不当家不知柴米贵
bù dāng jiā bù zhī chái mǐ guì
a person who doesn't manage a household would not be aware how expensive it is (idiom)
买下
mǎi xià
to purchase (sth expensive, e.g. a house) / to acquire (a company, a copyright etc)
冬虫夏草
dōng chóng - xià cǎo
caterpillar fungus (Ophiocordyceps sinensis) (The fungus grows within the body of a caterpillar, culminating in the emergence of a stalked fruiting body from the caterpillar's head, and is a much-prized and expensive ingredient used as a tonic in traditional Chinese medicine.)