Picked up a dozen of the SD Tour from my local walmart for $11.50 on clearance. Played a round with them and they are a decent little ball for $11 a dozen. Spin was pretty good on wedges, about like most urethane balls. Distance seemed acceptable, as was ball flight. My biggest issue was the durability seemed to be lacking. Again for $11 I think they are worth it, but the started showing significant wear pretty quickly.
May be worth a check of the clearance aisle at your local store the next time your their.