I love my soap nuts for nappies too. I love how they don't leave residue, no smell and are softer than when using detergent. I've heard some ppl put them in a cup of warm water before throwing them in the wash to get them going. I usually fill the machine, then let it sit for 15mins before starting the cycle. Definitely worth a try.
You can also buy them at
Green & Nutty and
The Wee Wuns.
And
BioNatural
Eco Bambino