Just picked up 8 of these for next season, should be interesting. Can't go wrong at this price I figured. Seems more durable than the traditional ones that my dogs can puncture.
http://www.amazon.com/gp/product/B00ULYKO9W?refRID=TZRYKWB1SF0PTJ5MRNEK&ref_=pd_rhf_sc_p_img_2
http://www.amazon.com/gp/product/B00ULYKO9W?refRID=TZRYKWB1SF0PTJ5MRNEK&ref_=pd_rhf_sc_p_img_2