Although there's strong interest in open access as the future of anthropological publishing, it isn't free. One of the best models for digital publishing is PLOS One but as their website indicates, they charge authors $1350 for publishing an article, and some of the other journals in their portfolio charge up to $2900. There are waivers available.
PLOS Biology US$2900PLOS Medicine US$2900
PLOS Computational Biology
US$2250PLOS Genetics US$2250
PLOS Pathogens US$2250
PLOS Neglected Tropical Diseases
US$2250PLOS ONE US$1350
Source: http://www.plos.org/publish/pricing-policy/publication-fees/
A note for Karen: One of the open source programs for open access journals is: http://pkp.sfu.ca/?q=ojs