Often if I go job hunting, there's a 25%-250% increase in salary. The 250% is often some tiny startup in a developed nation, which comes with its own costs; no healthcare, dodgy contract, remote, etc. But the idea is that it's easy to just take -- or turn down, a range much higher than you make now.
Protip: on the very first call, say “My current salary is XY. A competing offer is in your budget?”
Protip2: XY doesn’t have to be your actual salary, use a number that is your desired floor to start the negotiation from.