I can tell you that most casino's will NOT sell you a full rack of fractional chips. Heck, I've had Main Street Station treat me like a criminal for asking for 4 25 cent chips a few years ago.

You still might be able to get fractional chips from the Riviera, Sam's Town, Longhorn (Henderson), Joker's Wild(Henderson), Eldorado(Henderson), Railroad Pass,(Bolder City) Hacienda (Bolder City), Jerry's Nugget, Las Vegas, NV, Speedway Casino, No. Las Vegas, NV, Fremont Hotel Casino, Las Vegas, NV, and Main Street Station, Las Vegas, NV.

I'm sure I'm missing a few.

You might have better luck finding a "non-Nevada Casino that will sell you racks of fractional chips but then again, I don't think you're going to have much luck.