There isn't necessarily any malice intended; nobody is going to give you a price and honour it forever. Any quotes I do in my micro-ISV are valid for 1 month -

There isn't necessarily any malice intended; nobody is going to give you a price and honour it forever. Any quotes I do in my micro-ISV are valid for 1 month - not because I'm likely to change the price, but simply because I have no control over things like currency exchange rates and energy prices. But, I certainly don't use it to pressure the customer.