For the moment most my oil "studies" on paper are not for sale...they are afterall studies, and studies find their ultimate purpose brought to life on a larger support.  Likely a larger linen panel or stretched.  The paper studies allow me to work out ideas, experiment and push certain things.  I keep them in an art portfolio.  They may be available for purchase eventually.  Thinking to put together a coffee table type book featuring my small oil and gouache studies...