You don't need no steenkeeng torque wrench for spark plugs.
Just tighten them good and snug. Pay attention to how tight they were coming out.
But if you want a torque wrench, get one at the price you're willing to spend. My Craftsman is 15 years old, I ran it over with my Suburban and broke off the locking mechanism and it still keeps on ticking. It's $60-70 new I think. You can spend hundreds if you want but from the sound of your posts, you don't do a whole lot or you're a young buck just learning. Either way, if you're not planning on turning wrenches for a living get the craftsman or the Harbor Freight. They'll both outlive you.
Oh, and BTW, here's how you can buy us a beer: