How to Negotiate Without Trying

I went down to Melbourne's Queen Victoria market to buy a (toy) boomerang for Jacob.  The first place was selling them for $15, the next for $18.   The third place had the best selection but no price, so I asked how much.  They said $14 and I thought ok.  Luckily I only thought ok because as I stood there deciding which one was the best, the price dropped to $12 and then to $10!

And if you think $10 AUS ($8.90 US) is a lot to pay for a painted wood piece of wood, I agree.  And then I'd point out that a 20 ounce coke at the convenience store cost $3.50 AUS ($3 US)!