I know that dirt. You will want to keep watch on your runoff pH, especially after the first 6 weeks or so. The peat will cause pH to drop over time. A liquid pH test kit is fine for this and pretty cheap.

I've poked around the Hinsdale walmart and found a couple items of note:
Alaska fish fertilizer
SuperThrive
Cheap hi-lo thermometers with %rh reading
Blood and bone meal if you decide to go organic
Oddly, the selections for a heavily organic grow are better than the selections for a chemical-fert grow at wally world. Whudathunkit.
That location has a better than average plant selection for the outdoor garden.