I also use the Earthway bag spreader in the 2nd link. I like it a lot. The only thing I'd change about it is maybe adding a little padding to the strap. If you fill the bag up to the top with seed, all that weight can rub pretty hard on the shoulder with that small strap as you walk along. I've rubbed blisters on my shoulder more than once. You might want to improvise something yourself if you get this model. As mentioned before, it works REALLY well with small seeds like clover, chicory, etc. And not a bad price either.
And as always, if you ever need to use it to broadcast fertilizer in a small area, make sure to wash it out well afterwards. Fertilizer destroys just about everything it comes in contact with.