- GoFundMe -  - 8% total
- Selfstarter - http://selfstarter.us/ - install your own crowd funding platform.
- Bountysource - bounties for open source software projects - started by a TED Fellow, now deceased - 10% (or 13%?) charge. Can we use it for hardware? 
- Scalefunder - software as a service; the more projects, the more favorable this is - 
- Goteo - charges 11% total. Funding for the commons, but expensive.
- Indiegogo - most cost effective - 6% total (for nonprofits, if goal is met, otherwise, 10%)
- List of open source crowdfunding platforms - 
- top crowdfund sites for nonprofits - 
- One Percent Club - integrate with Design Sprints? People can also contribute time or skills. - 
- Shopfunder - you get 30% of sale from craft producers. - 
- MyClassCam - for schools, lowest fee - 5%
- WeTheTrees - Permaculture focus, 8,5% with processing fees (3,5%) accepts bitcoin - 
- EarthWays - No fees (exept payment processing if applicable), run by donations, still in development 
Conclusion: it appears that no open source hardware crowdfunded bounty site exists, and it should be created.
- PayPal / Amazon Payments - 2.9% + 30c (credit card)
- WePay - same as PayPal, but can also do Bank Payments at 1% + 30c
- Dwolla - nearly free, but only bank payments.