I guess "if you can come to a mutually agreeable figure" was lost.

I prefer to support my LBS but when I can get parts at less than half their price online it's hard to do it. For the price the LBS charged me to supply and fit a chain and cassette I could buy the chain, cassette, chain whip, lockring removal tool and chain tool online and still have a little cash left over. When their price for a basic bottle cage is £9.99 compared to £3.99 online it doesn't help. But at the same time if their listed price is £9.99 there seems little point expecting them to offer a 50% discount to get the business.

I still refer people to them because they are helpful and for anything I'm not confident doing myself I go there for their mechanics. If their price for something is within about 10% of the online price I'll still support them because their continued existence has a value to me. But it's pointless to pretend I'm going to pay whatever price they care to stick on something just as a matter of principle.