Seller Sent Metal Cards That Are Greenish Yellow in Tint Instead of Black. Very Expensive. Now Not Sure How to Resolve This. Need some ideas.

So long story short, I needed 400 metal trading cards. The cards are part of a larger bundle that go along with a special edition book I wrote.

I received one card from the seller and it looked fantastic. Black print on a silver metallic surface. Looked great. So I went ahead and ordered the 400, which cost $1200.

The cards came today, and unfortunately, they look bad... something happened to where the ink on the cards is yellowish/green. It's like this with all 400.

I immediately contacted the seller. He says he did not do anything differently. The cards are expensive to produce, and take awhile, so it's not like paper prints that can just be easily replaced.

What do we do here? I can't give these to my customers, and I also can't just eat $1200. What is the fair thing to do this situation?