Hmmm, well sculpey doesn't crack ever, but you have to bake it. I dunno if it's expensive there or not, pretty sure you can find it online for reasonable price. Stoneclay can be a pain, if it's drying in humid weather, but I don't have a lot of experience with it! I'm sorry this happened to you. Out of curiosity, what brand did you use?
I used a local brand here in my city, i didnt wanted to buy a more expensive brand because it's my first time making a doll, and a knew i could screw up a little, but i think it was a wrong choice ( D: ) I think sculpey could be a better option. Do you think polymer clay will crack this much?
Polymer clay won't crack at all, as it is oil based. Stone clay won't usually crack, but if you bought a cheaper brand, or a 'children's' type brand, it is pretty much guaranteed not to work. xD unfortunately, that's the works. Before you buy a new type of clay, do a google search for the name of the clay you used to see if anyone else has had any trouble with it cracking.
Sculpey is really great to sculpt with, but the downside is that you get one chance with it. You have to sculpt it all at once, detail included, and it's very easy to screw it up beffore baking. Then, when you bake the clay, you have to be really careful not to bake it too long or it swells, blisters, and gets really deformed. It's just a little testy compared to air dry clay.
If you let me know what other types of clay are available in your city, I can tell you which one is the best choice.