is there a decent Bike Co-Op near you?
option 1...go there and dig around for a similar shaped hub, whether it's laced to a rim or not. buy it. The Co-Op people might recognize the hub, and will tell you that finding a new freehub part online may be tough, at best.
you're already looking at new cones, balls, and an axle.. add the price of a freehub...... add up all the parts and shipping... i bet a used wheel may be the best route... i saw a pair of shimano New take off WH-R500s for $100, with Tires, recently, and once bought a similar pair for $50... etc.

option 2... find a good used rear rim of similar specs (700c, 8-9-10 freehub, 135mm O.L.D.) and install it, complete. these are very common wheels

option 3... realize that the brake tracks are worn and then choose option 2, plus a matching used front...

unmarked rear hubs tend to be from Formula of Taiwan/china... most re-branded "in house" hubs are also made by Formula... Quando has made significant inroads as of late, but your example is a bit older,and i'd be looking for a similar hub as a parts donor, replacing the entire hub with a shimano (ever laced a wheel? might be a good opportunity to learn!), or choosing Option 2, above.