If you control Urza's Saga, can you find a zero-mana artifact with its Chapter III ability?

Urza's Saga's third chapter ability reads: search your library for an artifact card with mana value 0 or 1, put it onto the battlefield, then shuffle. A card with a mana value of 0 — such as a Mox, Tormod's Crypt, or Black Lotus — has a mana value of 0, which satisfies the condition of being "0 or 1." (CR 202.3)

Mana value (formerly called converted mana cost) is calculated from a card's mana cost. A card with no mana symbols in its mana cost, or only {0} in its mana cost, has a mana value of 0. This is a perfectly valid value that meets the "0 or 1" threshold in the ability. (CR 202.3a)

There is no restriction in the ability preventing you from choosing the lower bound of that range. "0 or 1" is an inclusive range, meaning mana values of exactly 0 and exactly 1 both satisfy it. (CR 207.2b is relevant to how numeric conditions on abilities are read.)

Concrete example: You control Urza's Saga and its third lore counter triggers. You may search your library for Tormod's Crypt (mana value 0) and put it directly onto the battlefield for free. This is entirely legal.

Note that the card must still be an artifact card — the ability does not find non-artifact cards with mana value 0, such as lands or zero-cost instants like Gitaxian Probe.