It's really hard to save any money by building your own wheels.
The assembly factories that buy hubs, rims and spokes by the truckloads simply get so much lower prices on the parts that you as a small purchaser just can't beat it.
People build wheels b/c they like it, or to get a rim/hub/spokes combo that isn't available otherwise.
So a "cheap fix" it ain't.
Formula hubs for derailer gears tend to do OK but not great. Getting parts is more difficult than Shimano, but not impossible.
Don't know about SS/FG hubs.
I've used Circus Monkey hubs and been reasonably pleased with those.
If you want cheap, buy a wheelset off Amazon, eBay or similar. Check spoke tensions and bearing adjustment and ride.