I am looking for a way to produce high 100ug to 1mg amounts of proteins that are insoluble expressed in E. coli. I thought that cell free extracts might be a way to do this. These are bacterial proteins but I haven't been able to get soluble production of them in E. coli cells. There are various systems out there, such as these: http://www.lifetechnologies.com/order/catalog/product/K990100
and
https://www.promega.ca/products/protein-expression-and-mass-spectrometry/prokaryotic-cell-free-protein-expression/e_-coli-t7-s30-extract-system-for-circular-dna/
Does anyone here have any experience with these or other cell free extracts for transcription/translation, and if so are they worth it?