Apparently, they are suddenly unavailable.... here is the default index page they have posted on their site:
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Discount-Mats.com is Experiencing Technical Difficulties... If you are inquiring about your order, please contact us via phone or email. Thank you for your understanding & patience.
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FORTUNATELY, Google caches their search pages so here you go guys:
414-736-8394
Bargain Suppliers
3259 S.106th Street
West Allis, WI 53227
Maybe they should go out of business :-)