I just purchased 10 x 60u MPP toroids from EBay and it seemed to be to such a good deal that I'd share it. I don't know if 60u toroids are good for anything OU related yet, but I figured at 1.99 per unit for a molyperm toroid, I'd get some now and figure out a use for them later.
http://www.ebay.com/itm/10-Magnetics-Inc-C055586A2-Toroidal-MPP-Powder-Cores-/192217365315
Note: I am not in any way affiliated with the seller.
Feel free to post any deals you find.