I didn't have any problems getting dnp powder at a local chem lab store. Just use the yellow pages and call around.... It's called 2,4-dinitrophenol. There's some other posts that explain this in more detail.
I think it raises metabolism quite a bit more than 50%. 1lb of fat is about 4000cal. For example, if you're burning 1lb every day, your metabolism has increased by 4000 cal. So if your base metabolic rate was 3000, that would be 7000 w/ dnp. That's an increase of 133%. It may be quite a bit higher actually, I usually burn off about 2lbs a day on a high dose dnp.