you can also get self-sealing tubes. We have goatheads here in NM too and I ride with slime or air-loc in all my tubes plus teflon strips or kevlar tires, and haven't had a problem yet - well.....ok.....there was this One afternoon about a week ago...............
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"