By the time you buy the Grizzly wheel, pay for shipping, have a shop check to see if it's balanced, have the center milled out, buy quality bearings and have them installed you'll likely wish you had gone a different route.
Some makers have had good success with wheels from Sunray. They build wheels for a variety of applications, and about 5 or 6 years ago some makers started looking at them for a less expensive alternative for contact wheels. You can specify the dimensions and durometer you want, and if you talk to them directly and tell what you want it for they should fix you up. I've heard they'll even crown the wheel. They can make wheels with bearings or keyed for a drive wheel. They have a $100 minimum order now, but an 8 or 10 inch wheel will get you over that easily without breaking the bank.