
iGetcha.org is a suggested opensource and free software directory for the technological sustainability of nonprofits. It's also a simple, non-techie shortlist to assist organizations with a SOHO.
Again, iGetcha does not know much about Magento except that they do have an open source community edition. If you're not tech savvy, we still recommend simpler sites like eCrater, and if you're tech savvy, we recommend Uber Cart.
If you want to launch a website using Magento for your nonprofit and only have a vague idea of the internal workings of a website (ie HTML only), iGetcha recommends asking the community for help :) maybe you know more than you think ;) Heck, we did it :D