You can make chips at Skywater through Mosis. But then you are on your own for a lot of things efabless does for you. The Mosis shuttles for Skywater 130nm have a deadline of May 15 and September 15, while for Skywater 90nm they are August 16 and December 13. I have no idea what the prices are like. https://www.themosisservice.com/foundry-services