I just recently purchased from
http://Privatelabelsoapnuts.com
I got my 5 lbs for a fraction of what I was paying before and the quality is really good so I'm a happy camper. If you're buying in bulk I highly recommend those people. They sell in different grades at different prices so depending on your need you can get pieces, unsorted grade A - grade D but all of it is far more affordable than anywhere else on the internet with no sacrifice for quality. That said, The price of a bulk 5 lb bag of piece per load is around 1-2 cents per load with shipping - comparable to the DIY detergents with less of the work.
I generally don't buy into one brand being better but I do respond to pricing and bang for buck. I did notice on the site their grade D has resembled what I've purchased elsewhere at other companies as a "select" grade for way way more money.
I'd also like to comment on the OP mentioning seeds causing stains. I did once purchase some soapnuts with seeds, and I used them for at least half a year without any kind of staining. Nothing I own is expensive though (maybe they just stain expensive clothes? hehehe). I think that's just propaganda by the seedless companies. I do enjoy using the seedless though, it's just more convenient for me, but I don't think anyone needs to be scared away.