yeah you can add a TRD Supercharger on your camry, but you just gotta wait for couple of months till its out :)
the TRD supercharger range from $1,200usd - $3,000usd.
If you wanna boost the performance, remove the stock air filter box and change it with POD Filter. Also change the Exhaust. then after that when you have couple of $$$$ change the Headers, piping and all the way to the exhaust piping. hehehe.... Anything is possible with $$$$