I need to budget the cost for publication for a European grant that requires open access, either green or gold, and I am struggling to figure out the costs over a five year period. Some multidisciplinary journals can have open access fees up to €10,000 and specialized journals between €2000-4000.
When I add things up it comes to a considerable amount, around €100,000+. I find unreasonable to pay this much for publishing when research money should pay for research, so I am wondering how people budget these publication costs in recent funding application. What are some real costs after 5 years?
I know that in some cases the green open access does not cost because the publisher allows to post the accepted version on a repository within six months. But publishers are becoming more restrictive about this.