Hi Lew. Greetings from PEI.
Defender LTX is a good tire. My price all in installed, balanced, taxes included, including road hazard, no charge seasonal changeover and 24/7/365 North America wide tire roadside assistance is $1120.00. So your Kal Tire price is OK. Forget Costco, they are a pain in the rear to deal with and Defender to Defender their tires are not exactly the same. On some models they buy a specific tread design exclusive to them. I am not a fan.
John