I'm guessing you'd have around $200 in gas to get them, you'd still come out ahead. Especially if they are u joint frts (worth about $200 more apiece than ball & claw). It's easy to check when you get there, cut the boots or take the bigger boot band loose, turn the axle hard against it's stops, then put your hand in a wal mart bag/rubber glove or just your hand and feel inside. If it's u joint you can feel the cap and snap ring easy, then start cleaning off all that grease with the roll of paper towels you brought!
Thing is about these rockwells, when I'm out everybody wants some, when I have them everybody wants tires and rims which I have none.