Ultrasounds are not handed out willy nilly nor treated as some sort of game. The need to regular ultrasounds occurs, but not in normal, low risk pregnancy.
Not in the public system, but i have heard of many Obs who "just check how bub is going" with a "quick" ultrasound every appointment! And then there are the places who offer 3D/4D scans for cash where you don't need a prescription. You can even bring friends and nibblies, hang out on the couch and watch bub wiggle!