are these loose ball bearings? anyone know where to find these online?

Yes, those look like loose bearings to me. If you need to replace them, any bearings will do, as long as they're the same size. You can use calipers to measure them, but I've also seen a tool in some bike shops which looks like a ruler with different sized holes in it which you can use to determine the size. Any good bike shop probably has different size bearings in stock, too.

just cleaned and replaced the bearings in my suntour superbe pro hubs too. you'll need:

front hub...3/16"...10 per side
rear hub....1/4"......9 per side

just buy some grade 25s from performance. they're pretty inexpensive.

edit- oh, nevermind, someone knew the answer before i posted this.

I believe those are sort of a hybrid between cartridge bearings and cup and cone. I'm not sure but you may not be able to get the bearings out as there is some sort of race in there. Rather you would have to pull out the whole "cartridge".

I don't know much about them but I know some of those supurbe pro hubs had a unique bearing setup, and I think that's one of them. If you don't have luck here ask in the fixie forum.

and just replace the balls?

The cones should be two piece items that CAN be pressed apart. If so, and you remove the cups in the hubshell, you can install #6001 sealed cartridge bearings like Mavic, Suntour XC, Sanshin, Specialized, etc.

You'd do this to fix the hub if you'd pitted a cone or cup and couldn't get a replacement part. Conventional cones will push the bearings out of their intended track in the cup, as the hub is almost a radial contact bearing hub, as opposed to the angular contact bearing used in most loose ball hubs.