Well if they are selling at a high markup they are not losing much. So maybe %25 or more on discount?
If they are selling for a slight margin then they can't do it. % 0 discount.
If they are doing it for a mediocre profit , they can probably either won't do it or discount it slightly like %5 or so.
but I think it will be very difficult to find a market that can provide a 25% discount. I've seen on average 10-15% and if the deal is 15% the distribution is from 15% you will get 1-5%. but it doesn't hurt you to try to reach an agreement up to 25% and you have a good concept Good luck!