Im like that with salesmen
We had one around to quote for double glazing..
He asked what I wanted and I said "your best price first, with no messing around or you'll be wasting your time"
He still did the old... I'll just phone my manager to see if we can do you a deal
We ended up going with a local family run business that we know; he came, measured up, discussed options and then said he'd post the quote which would be non negotiable... payment on completion
Guess who we went with? Oh and he was over £2k cheaper for 2 doors and 7 windows that the national company