There are portable steel tripod frames that collapse and take up very little room storage wise. The ones I have seen have been custom made. In terms of affordable, that depends on what you consider affordable, as well as what tools and skills you have at your disposable. If you have the tools, strong mechanical skills and can accurately calculate the weight bearing requirements, you could make your own. In my opinion, wooden frames do not have the same versatility in terms portability and storage, but require less specialized tools to make. In either case, there are various plans available online. There are a few available for sale online that typically cost several hundred dollars, plus shipping/freight. In terms of those available for sale online, my advice would be buyer beware. Make sure you know what you are buying and who you are buying from. The same goes for plans that are available online. Do your homework, do your own calculations, and talk to people who have actually done it.