graphics card help needed

[Carrym]

My nine year old brother is desperate to play Lego Bionicle Heroes but our elderly P.C just isn't up to it. Error message says the graphics card needs to support pixel shaders 1.1.
Can't afford an expensive graphics card or new P.C. Can anyone suggest a really cheap card that is compatible with our machine and will run the game?
The only technical deatail I have about the machine is AGP 66/133Mz, VGA. and we have Windows XP.
The game gives min requirements as "DirectX 9.0c compatible cards with 64MB ram, supporting vertex shader 1.1 and pixel shaders 1.1."
I know little about computers (as I'm sure you can tell) so any help would be gratefully received!

[Crippler]

Those min requirements look like my current card, a Geforce 3. What is your CPU speed? That will help determine which cards to look at. Take a look here: Newegg.com
Something in the $50-100 range should do just fine. All of the cards available today exceed those game requirements, so don't worry about that so much. Of course, you need to stick with AGP cards (type of connection) and not the newer PCI-Express versions. Any AGP speed will work (the 2X,4x & 8X) , you'll just be limited to what your current PC supports. Odds are it is 4X. Take a look at the cards on Newegg and let us know how much you're looking to spend. Then we can drill down to the best card for your $.