It is called a mutt, mixed breed or Shih Tzu/Poodle/Cocker mix.
I would pay like $50 (if I wanted that sort of mix, but don't). $150 might even be reasonable. You would have to check your area. I've seen some poodle mixes and shih tzu/poodle mixes for free. So you will have to check your location. There is things to consider like pre natal care, aftercare for mom, plus vet care for the pups and feeding them all those added expenses. I'm sure smaller pups eat a lot less then larger ones typically. Possibly putting money towards getting mom spayed too.