I am still on a quest for seed for white anomatheca, or any other color. I have the orange/red but wouldn't mind getting more of that color.
Silverhill seeds has in the past sold both the red and the white (Anomatheca) Lapeirousia laxa. They currently offer several species of Lapeirousia; but because of a 3 year drought have not collected any Lapeirousia laxa in the last 2 years. NWN Nursery in Florida still has 3 yr old Lapeirousia laxa seed which is not listed on their website. It is only $2 per pkt and you'll likely get 30-50% germination with seed that old.Tel 850-638-7572. They accept personal checks but no credit cards.
You can also contact Silverhill Seeds at http://silverhillseeds.co.za
Here is a link that might be useful: NWN Nursery