When we moved and I didn't have my room set up right away I used the rubbermaid bins the stuff was packed in. I lined the bins up along the wall and put the toys on the top of them - ideal height for the toddlers to stand up at and play right there. And when I wanted to rotate toys just traded with what was in the bins.

Take your chairs from the dining table during the day and line them up along the wall - a toy will fit on a chair as well as a bin, basket, or cardboard box will fit under the chair to hold other stuff. Then just put in large bin at night and chairs back to table for adult use.

Check out kijiji or usedottawa - there are often some almost free things on the lists. Also value village and other second hand stores also will have shelves for very cheap.