Just get one that is made of stainless steal or just get a replacement head. I personally would recommend this seller:

https://www.italianbarber.com

But you could google the razor of your choice and buy from anyone else. I'd also grab some blades while your at it. Failing that, look for WWII razors which are made of brass and will never do this. Just avoid razors made of pot metal (get bare metal of your choice).