Labor for a stock location intercooler is going to be pricey, several hundred bucks at a minimum. You can do it yourself, but you'd better be handy or have a friend who is.
Alternately, you could put in a FMIC if you are going the diy route; they're much easier as you really only need to remove the bumper. GTIjake on here makes a really nice kit that will future proof your build as it's big enough to handle big turbo conversions. The CTS and neuspeed ones are a bit small, but will handle is20 power levels just fine and be a big step up from the factory IC, but for the price I'd go with Jake's unless you can get a good deal on a used one.
