You need a step-up transformer to convert the voltage from 110v to 220v. You also need to make sure it can handle the power of the blender.. Read the label on the blender, it will tell you how much power it uses...
I don't know about yours, but my blender uses 525W at full power. And a 525W step-up converter is going to be about the size and weight of a small car battery.
Here's a picture of a 500W converter. It costs about $30 USD:
If you still want to use one, look at an electronics store, not Future Shit or Worst Buy.
But knowing what you know now, you will realize that like I said before, it's not worth the trouble.