Third world countries are cheaper for certain things. Namely products with a lot of local labor, which is cheap. That's why food (locally grown with local labor), rickshaws (driven by local labor), etc. are very cheap in India.

But items which aren't produced by local labor aren't necessarily so cheap. For example, the RAM, CPU, batteries, and LCD screen all come from the same places that US manufacturers buy their components. So they aren't going to be any cheaper because the product is sold in India.