Shelter for whom, or for what purpose?
Please tell us a little more about what your goal is with the shelter, so that we can answer your question.
You. Ours get a pop up tent with sides I bought one on eBay 60 bucks and the sides are 20 dollars
Build a frame using something that is lightweight, like Pvc pipe. You can use painters canvas for the top and sides and apply betting to some spots for air to get to, but make sure you can cover them up in case of rain. Use tent stakes to keep it on the ground, attached like it would be with a tent. If you need to you can always take apart the pvc to move it to further away areas and easily put it back together as long as all parts are not glued together at the joints.