It may not be that expensive if you are able to do the work yourself. You also can save $$$ if you shop around for materials. Another option is to use slightly used materials, or construction left overs that peeps might be getting rid of. Check Craigs list. ( I do not know your location, but here where I live, MUCH is available at times). If you want IDEAS on design, click COOPS at the top of the page.
WISHING YOU BEST