As you can see, there are no "$1" chips. The 25 (peso) chips are the closest (~$1.39USD). The 100 peso chips are ~$5.55USD. The 500 peso chips are ~$27.78USD and the 1000 peso chips are ~$55.55USD. I'm using 18 pesos to the US dollar because that was the casino exchange rate. Banks were offering around 19 pesos/USD.

By the way, I realize you can probably get pesos at any large bank in the US, but I have some paper currency in my wallet that I exchanged at an ATM (5.5% bank surcharge plus a $5 out of network ATM fee from Wells Fargo). I can bring some back if anyone wants to buy it. Pretty much at whatever cost we can agree to (I don't need to make anything, but would like to get my costs back). I'll post some pics in a moment. Denominations are 50, 200 and 500 pesos (divide by 18-19 to get approx USD value).