I believe wolf08 asked for a solid state tesla coil, not just a high voltage generator. Ignition coils and flyback coils cannot really be considered tesla coils, as they are not air-cored, nor do they operate using resonance, as a true tesla coil does.
wolf08, in my experience, there really is not a "simple" sstc circuit. You would have to have access to parts like high-power FETs and IGBTs, which, for the most part, are not sold at Radio shack. I would recommend you look online for parts and see if you can buy them online. You can also find circuits for solid state tesla coils by googling "Solid State Tesla Coils" or something similar.
I wish you the best of luck!
Der strom