For $129.99 suggest you check out the Avanti 110v paint and stain two-stage sprayer sold at Harbor Freight. Just needs a long extension cord. My guess is it's a low price sprayer that probably works pretty good especially with oil based stain and forget about using a backpack cordless sprayer designed for spraying chemicals.
Avanti $130 ......
http://www.harborfreight.com/2-stage...yer-64933.html ....... customer video ......
www.avantipaint.com
You know Walmart-Gilford has Olympic quick cover exterior stain in cedar or red wood for $14.97/gal.