Am I correct in understanding that you are drawing attention to the price of Dometic Powercare at the CC shop and comparing that price to an on-line price for Dometic Powercare tablets elsewhere, but you don't know if you are comparing like for like?
Don't you feel it's incumbent upon you to check before posting if your post is intended to warn fellow forum members?
Arguably taken at face value some reading your post will shy away from the CC shop purely on the strength of your post! Is that fair?
Hopefully, in the fullness of time you will research the true situation and post to confirm your assertion or, as it were, put the record straight.