If you are in this for the long haul, invest in a copy of the Darkroom Cookbook by Steve Anchell et al. It has recipes for virtually everything, along with explanations. If you are not interested in mixing things yourself, Photographers Formulary sells kits of the various reducers (and intensifiers) pre-packaged.
The basic Farmer's reducer is SO easy to mix, though, that if I were you, would just buy a little sodium thiosulfate (hypo) and some potassium ferricyanide (bleach) and mix it yourself. You can always use both of those chemicals for all sorts of handy things in the darkroom. www.artcraftchemicals.com will have all of these for pretty cheap.