A really hard situation to deal with. If it is a big dealership, I would tend to say "too bad", their volume probably will make up for it. But- if it is a small dealership, that does not move a lot of equipment, it has a bigger impact on them financially. Not sure of those factors in this case.
Otherwise, most states have rules or laws regarding commerce, that if a written quote is given, it is legally binding- but only for a set period of time. I was specing out a tractor last winter, based on a 6 t0 10 month window till purchase. The salesman understood, but was very clear that the quote was good for only 30 days, and that was documented on the form. I can see where this protects both the seller and buyer. So, even if the sale had not been made, likely the dealer would still have to honor the quote legally, but as mentioned by another post, forcing the issue may not be handy when it comes time for service.
Even when shopping for large appliances, I have had to pay attention to what is being quoted. One time, looking for a new stove I was given a quote that was only good for three days. I asked why and was told that the price was a "special deal" through the manufacturer and ended in three days. Essentially it was a 10 % discount and i think the salesman was trying to push the sale to keep his numbers up. (no I didn't cave to the pressure

). I think sometimes, in an effort to make a deal- no matter the motivation, mistakes are made. We all need to learn from the mistakes and not make them again...