I would point out that the empeg power supply is a good quality switched-mode model. I know the new version looks like a $5 unit from Radio Shack, but you'll have to trust me that it isn't.

That said I'm sure you can get them cheaper locally, just take care to get something good quality.

The ferrites supress EMC emission, and are required for us to sell the product legally within FCC and CE regulations. They don't affect the functionality at all.

Rob