I'd suggest Etsy for vintage wire baskets, but you'll want to shop around because different sellers can have wildly varying prices.

The Container Store has some very nice ones that are vintage looking (I have one in my kitchen) if you want to get more than one in the same size.

Here is a link that might be useful: Container Store Wire Baskets

If you're still looking, I found the farm-style wire baskets at Ross. They were $6.99 each. I also found a couple at Home Goods for around the same price. Good luck!

Have you checked out Farmhouse Wares? They may have just what you want.

Here is a link that might be useful: Farmhouse Wares