ground effect kit

Generally, yes. That's because the kit is kind of integral to the car and are applied at the factory during the assembly procedure.

I'm surprised they totally turned you off. Check TRD to see if they have an 'after' kit for your year and model. I'm surprised the dealer didn't mention this.

Also, there are plenty of companies that have after-market kits available. They will be more than happy to take your money! Ask around at the 'bling' shops, they will be able to give you more info as to which are the better ones.