You should buy your Instyler on Ebay from a person with good ratings. I got mine for $49.99, and it works great.
Also, make sure the person you buy it from on Ebay has good feedback so you don't get burned. Also, be careful of the people on Ebay selling it, some are just selling the bag and instruction manual or the styling products, so read the auction before you bid. Since I started using this, I have never gotten so many compliments in my life.
Make sure you use a good glosss finish flat iron balm like got2b Guardian angel. Don't buy that expensive stuff that Instyler tries to pawn off.