Hello good people of Mumsnet- perhaps you can help us out as my husband and I are a little bit 
.
We posted a job on mybuilder.com (damp in a small spot), specifying that we thought it might be a roof problem based on our handyman's opinion but were looking for an actual roofer to confirm. At this point we had literally no idea whether it was going to be a huge job, or a tiny replaced tile, or even nothing to do with the roof at all!
We shortlisted several people in our immediate area, but some people from over 30 miles away reached out and contacted us first to say they'd come round and have a look.
One guy came last week, looked quickly, said he'd email a quote, left. No problem.
Another guy came today. He had come from quite a way away, and was very thorough with his inspection of the roof. He didn't mention money but asked us when we wanted the job done. We said ASAP, but that we would need to have a rough idea of the price first, because if it was going to be a lot, we would need to wait a month or two in order to save up.
His quote (£600) was too high for us right now so we said: "oh, not this month then". He said he would "do the job and wait", whatever that means, but when we declined that, he then said "well how much would it have to be for it to be done this month", and we said, lightheartedly, "oh £200 is all we have available this month so that's not going to be enough is it!"
He then stormed off, shouted at his colleague to get in the van and left. We heard him through the car window shouting "£200! Fucking £200! Joke!" etc etc etc, implying that we had asked him here to do a job for a third of the price.
We were left a bit confused, because surely the idea was for him to come and give us a quote, and then we would see if that was too high or low for us.
He seemed really put out that we didn't want to book him there and then, and seemed not to understand that we really had no idea of the likely price so had no way of knowing in advance whether we were in a position to afford this job immediately or a few weeks/months down the line.
Please help me understand if we inadvertently mis-read the etiquette here! I'm very happy to be told we were in the wrong somehow; we don't want to waste anyone's time and now I'm a bit worried about saying yes to other people coming to give us a quote just in case we accidentally mess them around.
Thank you :)