A Tanzania safari price is mostly a handful of lines: park fees per person per day, the vehicle and guide, where you sleep, and how many people share the vehicle. Park fees are set by the parks and change, which is why we do not print a single number here.
The two choices that move the price most are the lodging level (camp, mid-range lodge, luxury) and whether you travel privately or share a vehicle. Length matters too: the Serengeti and Ngorongoro Crater cost more per day than a short trip to Tarangire.
Ask every operator for the price in writing with park fees, transfers, meals and drinks shown separately. Then you can compare like with like.