Good thought, but most people who are wanting to consign are going to want at least 50% of the sold price. Without knowing that up front, it would be a huge risk to speculate what the end auction amount would be, not to mention a big expense.
Just wondering, can you rent a cheap place across state lines and that will be your main business address, but you will allow people to drop consignment off at your home? You can also store your stuff that's not in season there. Don't you live somewhere near the border?