Don’t quote price ranges. When you tell a prospect that your offering falls somewhere between X (the lowest price) and Y (the highest price), you both lose.
The prospect will hear what’s in their best interest: X. The vendor (you) will hear what’s in your best interest: Y. No matter what price you settle on, the customer will pay more than they expected and you will make less. Both lose.
When quoting prices, give one number. You may need to negotiate down from there, but the customer can only feel like they are winning. And if you go in prepared to trim down from the original quote, you will win too.