They may not be able to accept an offer, but they can normally throw stuff in for free. We paid asking price for ours, was the last one of the type we wanted the location we wanted.
Can’t remember the details but got a few bits and bobs upgraded, which at list price would have been a few thousand. Obviously works for them as the list price is not what they pay.
Although saying that when I looked at the cost of the hob and extractor their price was lower than AO. I assume because they’d had an agreed price before there was a COVID tax added, and all the brochures had those prices in so they just kept them.