You can play real money Sit and Go poker tournaments at PokerStars across a wide range of formats, variants, and buy-ins. These tournaments start when the correct number of players have bought in, from only two up to 180.
But here is the quick answer. PokerStars is not rigged. It just appears that way sometimes due to the incredible speed of online poker. Because online poker sites like PokerStars typically deal hands 3 times faster than a live poker game, you should expect 3 times as many bad beats.