2nd class larger letter cost

We well a lot of items posted through this service. There was a recent price rise with RM in October so don’t think much of it when amazon price for a 150g large letter went up to £2.30, assuming they’re reflecting the RM increase. However if I go on the RM website, 2nd class large letters up to 750g is only £1.55? Am I missing something?

Depends upon if you’re looking at business price or general public price.

Royal Mail run campigns online giving the general public cheaper prices from time to time.

Fair - No not really!