The cost for RepricerExpress is based on the number of repriced products you have on each channel. So for example if you have 5,000 products on Amazon UK and 2,500 on Amazon US this will be counted as 7,500 products. Even if the 2,500 products on Amazon US are also for sale on Amazon UK they are still counted as separately repriced SKUs.
If you turn off repricing on products then they are not considered repriced SKUs. RepricerExpress stores the total of your repricing products throughout the month, the day with the highest total is considered your total for the month.
If you have any questions regarding your billing why not take a look at our Billing FAQ Helpfile?