Asking "What is your budget?", or "Do you have anything left in your budget?" typically results in an objection.
The fact is, if you are talking to the right person, and the need for what they want is strong enough, they will find a way to get the money.
Art shares a story about a call he received where the rep killed the call with his question, and what he--and you could do instead to get people talking about buying what they want.
The Art of Sales with Art Sobczak