paro

Paro, parare, paravi, paratum is a plain first conjugation verb, and its perfect participle paratus long ago set hard into an adjective meaning "ready": paratus sum, "I am ready", is far commoner in this corpus than any finite form of the verb. The second sense, "provide, obtain", is the one behind pecuniam parare, "to make money", and it is why comparo can mean "buy".

The trap is that paro is not pario, "to give birth to, bring forth", despite the overlap in the present stem, and it is not the source of English "prepare" on its own - that is praeparo. Latin also has a second, unrelated paro meaning "to make equal", from par, which is why apparatus, imperator and even "pair" all cluster nearby without quite belonging to the same family.