Check ebay . . . New Mirage Plus Prop or slightly used props can be had for $200 - $300. 19 is just too much prop for your motor. You might try a 15 or 17 pitch Mirage Plus, Rev4 or Vensura.
Here's a 17 pitch Mirage Plus.
Offer this guy $200 . . . I bought a 19 pitch from him @ that price. Click on the "make offer" button.
http://cgi.ebay.com/ebaymotors/NEW-M...QQcmdZViewItem