according to the information you have given I am thinking that you are undergone tubal ligation
after one baby.
Tubal re-canalization is the surgery to be done to make fallopian tubes patent.
Overall chances of successful recanalization means chances of becoming pregnant are 30% to 40% only.
The success depends on the method by which tubal ligation was done.
If tubes are occluded with rings the chances of recanalization are high. If tubes are cut and ligated the chances are medium and in case if cauterization
was done to remove the bit of the tubes the chances are low.
Success of recanalization also depends on the remaining length of the tube. Normal length of the tube is 10 to 11 cm. If at least 6 to 7 cm of tube is remaining the chances are high.
If history of any associated diseases of the tubes are there like pyosalpinx the chances are very low.
Cost of the surgery will depend on the hospital you choose. You can enquire in your local city.