Leaky tires?

Anyone else having bad luck with new tires? I ordered three tire tubes after two went flat on my diablo carbon and both new ones worked initially for a couple weeks and now one is leaking again. I went to replace the leaky one with the third one I bought and it is leaking before I even put it on. I checked it by adding air before I pushed it in the rubber tire and can hear it deflating and it is not from the valve stem. Are these prone to leaking from the get go? Is there any option outside of the evolve 7 inch 50 psi tubes so I can enjoy the board for more than a few weeks?