Kingtop 3" black grinder. Been using mine for over a year now and it's still sharp and collects kief really well.

https://www.amazon.com/KingTop-Spice-Tobacco-Grinder-Large/dp/B00ZOVKLKY

I buy these from amazon they are great and not to expensive

KINGTOP Herb Spice Grinder Large 3.0 Inch Black https://www.amazon.com/dp/B00ZOVKLKY/ref=cm_sw_r_apan_glt_fabc_1NGT7KBDV9HCY1PSN1NX?_encoding=UTF8&psc=1

DHGate isn't really well known for having good grinders but here's a few you may want to check out:

here here and here

However you're not gonna see much if any savings between the 'gate and Amazon or similar, try these: here and here (this one's 3 inches wide)