17199 GM RECALL

Can anyone tell me or have any literature on why GM would change the price of the module part number 42619308 from $450.00 cost to $150.00. Yesterday we tried to submit a claim for this and it was way over. My DMS (CDK) showed a cost of $450.00 went on Global and it stated the part was $150.00. I even checked my GM invoices and I was only charged the $150.00 but why change the cost?