Drive/strike a hard bargain
Definition 1 of 1
Pro Tip 1/3Negotiation Skill
This phrase suggests someone is skilled at negotiating to get what they want. 
Despite the initial high prices, Mary knew how to strike a hard bargain and got the car for her budget.
Pro Tip 2/3Resolute Approach
Implying a firm and sometimes slightly aggressive negotiating method. 
He's respected at the market because he drives a hard bargain and never wavers.
Pro Tip 3/3Not Always Positive
Can imply being difficult in negotiations, which might be viewed as negative. 
The vendor found it exhausting that the customer always struck a hard bargain over minimal discounts.