OT, parts pricing on timing belt

(1988 Acura Intergra GSR)
Timing belt kit (timing and tensioner) around $100 Condi brand
Timing belt around $30 Goodyear brand Tensioner around $25 Koyo brand
I know they are from different companies but why buying individual parts 50% less than the kit? Is the Condi brand so much better than the other two?
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