Table game minimums depend on how many people are gambling, or WHO is gambling. When we go, they usually open a table for us and set the minmum at $500 per hand because we do not like gambling with people "that play carelessly"...when you have $500 at stake, you arent going to hit again and bust, or double down... if the casino is full of high rollers, there will not be any low tables. I have seen low minimums at the older casinos...usually between 3 and 6am on the weekdays (M-Th). Do not plan on anything less than a $25 minimum on the weekend at any of the high end hotels (Venitian, Bellagio, Wynn, Mandalay Bay) At Bellagio, the weekend after New Years, we were looking for a cheap table to teach my friend how to play cards, cause he had never played. We ended up finding a $50 a hand table on a Saturday night, and we waited about an hour to get a spot. Later we went over to the dumpy hotel next to Ballys called Barbary Coast? And found $15 a hand Black Jack.
The bottom line is go to an older casino, and go SUPER late..2am or later on a weekday and you will find those minimums. Good luck!