Best sites to buy throttle bodies?

[Hp Mustang]

Throttle body question

I want to buy a 70mm throttle body and I also want to pick up a new pair of at least 3 inch exhaust tips what sites can I find the best deals at for these?
I was also wondering if the throttle body is all I need, in other words will it just replace the stock throttle body that there, or do I need an adapter?

 

[atlblue2000]

What other mods do you have? If you're still near stock, it wont really be worth the cost. I'd look into putting that $$$ into other mods, like gears, pullies, wheels, shifter, blah blah... As far as the tips go, I got mine from a local exh shop; for the sake of shipping costs and what not, you might be better off going that route. Just a thought...