Bangladesh Sundarban tour - booking on arrival.

Hello!

Has anyone had experience booking a Sundarban tour either in Dhaka or Khulna?

I managed to do this easily in Chitwan, Nepal, but im not finding out as much information online or the tours seem extremely overpriced/im usually a budget traveller.

My goal is to try and see a tiger, which I never saw in Nepal, if anyone knows of a company or tour they could recommend.

Any advice would be great.