I'm not savvy enough to know if this is cost effective and I don't think this is an online course offering either so it has very limited utility but I thought it was interesting enough to share because I know I've seen the question asked about how one can obtain a science lab credit. Fayetteville State University in NC has what they call their 10 day (2 week) Maymester session, and in their course offerings I see two available 1 credit science labs. I have heard of other schools offering intensive, abbreviated semesters like this so perhaps something to investigate closer to home if needed.