Murph,
There's one method you may not have thought of for those hard-to-get fractionals.....often the cocktail waitress will have them in her tip cup! You just need to "color em up" at a better exchange rate than the cage!!! "vbg"

I have to admit, this was not my idea...a friend wanted to get me some chips in Memphis, and the cage wouldn't sell them....she doesn't play table games, so this was how she did it!