Usually, unless there is a poker room, you are not going to see a lot of $1s. The Casablanca had a poker room, and I did see stacks of $1s, but most of what was on the tables were $2 chips since they had $4/$8 limit and $1/$2 NL while I was there. There are several racks, but they are being hoarded.
Honestly, for the $1s, I would harvest and relabel or just use the harvested as your $1s. I just paid $2/chip ($215 after shipping) to buy chips that I am putting $20 worth of labels on so I can have $100 worth of Casablanca $1s, seems counter-intuitive. What makes sense is pull $100 minty $1's off the poker tables and use them, even if not a perfect match. If you can get yellow chips, much closer to the real ones, but no one will care if they are blue or white, unless you are also using actual white $2s, then you are fucked.
I am all for matching chips, but when the chip is $10/each, I look for substitutions.