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How do you convince your boss to buy useful tools like Resharper, LinqPad?

I've recently started a new job developing code in C# and ASP.Net. At a previous employer I've used ReSharper from JetBrains and I loved it. I've downloaded the free trial in my new job, as have several of my new colleagues on my recommendation. Everyone thinks it's great. But now our trials are coming to an end and it's time to buy or say goodbye.

I've been reliably informed that getting money for tools from senior management is like trying to get blood from a stone, so how can I convince them to loosen their grip on the purse strings and buy it for our team (of seven developers)? Does anyone have any experience of convincing management of the benefits of refactoring tools? I feel the benefit every second I use it, but I'm having difficulty thinking of how to explain the concrete benefits to a manager who only think