The couple of posts talking about variables are spot on. We are often not talking commodities, so working to do a driveway at my house may be grossly different than another (cleaning etc). Timing matters, a vendor may be filling an open slot. Some vendors might offer discounts in some cases, I've gotten military discounts in a couple of cases.
To me, it is like buying a car....how much for your Toyota Canry? Well what model, what options, even paint colors can be hundreds of dollars. It's not fair to compare a base model with highly optioned prices.
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