I don't know, but I recently asked a guy about his tungsten carbide ring, and he said it only cost him $20. I just searched for "tungsten carbide ring cheap", and this result came up: https://www.amazon.com/Tungsten-Metal-Wedding-Comfort-Finish/dp/B00A7ZZLD4
FYI - don't get screwed on the bands like I did. I thought I did my research on bands, especially men's. My friend bought this Tungsten ring from Amazon while I bought my tungsten ring from the jeweler. He paid around ~$15 for his and I paid a little over $100 for mine. Rings are identical.
If you get tungsten, don't get it from a jewelry store; they rip you off big time. Not like you can resize it, nor like it really visibly scratches or otherwise needs any treatment.
There are many, but here's a good place to start: https://www.amazon.com/Tungsten-Metal-Wedding-Comfort-Finish/dp/B00A7ZZLD4