Charity bike purchase

Hi
Just a quick question as I'm unsure if my reaction is either extremely rude and ungrateful or extremely fair.

Me and 4 friends are doing a charity cycle run next year over 2 weeks and we need new bikes so we approached a few manufacturers to see if they would be interested in discounting bikes for us to use in return for (admittedly very local only probably) advertising.

We got an offer from one that was just under 30% off which is very nice of them.
But I then found out through speaking to my local bike shop that in effect the offer they gave us is what they sell to shops for, so if we wanted he would get them and offer them to us at cost and we could post his shop as supplier of the bikes(its probably what we will do).

But we have a meeting with the manufacturer and I kind of want to ask for a bigger discount as they aren't actually discounting THEIR usual selling price..

What does anyone think?

Take it man that's potentially £333 over every 1k you spend so that's a pretty good discount ?