Short answer: Yes.
All our displays are metal wireframe displays, and most don't stand on their own. Even when ground stakes are included with the display, they serve to keep the display grounded but don't keep the display from falling over. Our ground supports are very sturdy 5/8" steel rod with a unique "h" at the bottom for exceptional rigidity. We like them. But, pretty much any sturdy stake will do.
Go to your local garden center and look for plant or landscape stakes. You'll find many different thicknesses and lengths. Bag twist-ties make for easy attachments to these. If wind is your main enemy, use fishing line and landscape staples to tie from the top/middle to the ground. And don't forget about natural support: you might want your display in front of a tree or a bush anyway, so use that for support.