I don't know if anyone other than Sizzix.com offers the Texturz kit, but I ordered my BISK from allthatscraps.com. I've seen the BISK on other websites, too. No matter where you look, it's going to be about $19.99 (assuming it's in stock ;) ).
I agree with yytx that getting the Big Kick machine itself from costco.com is a much better deal than ordering it from Sizzix.com.
The Big Kick also does a fantastic job of embossing with the Cuttlebug embossing folders. Just so ya know.