Fedco's catalog for 2005-6 has them - hopefully the 2006-7 will too:

http://www.fedcoseeds.com - click the "Moose Tubers" link then "catalog" or use the PDF direct link below

Here is a link that might be useful: Fedco Catalog

A friend ordered some and they are the common yellow skinned potato onions. They didn't make it clear in the catalog which they were.

hello mark,
no i have had no luck in finding white potato onions. i still think there is people out there growing these onions that have been in their family for years. hope one day to find them.
the henderson topset i got from you did good.took them up this week. thank you again.
lori

http://www.southernexposure.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=PONION

I went to the Southern exposure site. The question I have is the order for the organic white potato onion is $8 but it doesn't tell you how many you get.
Ernie J

1. The white multiplier onions offered in SESE are NOT white potato onions. They are more likely Heritage Sweet according to their catalog description and website picture.

2. Quantity received for $8 is 4 ounces.

3. The only potato onions that SESE has are the yellow ones.

Martin