Instructions
Go directly to online auction sites. Online auction sites have created an entire market for items otherwise relegated to the yard sale. Not only will you find the biggest collection antique bird cages on those sites, but because of the supply, the deals will be the best as well. Always be sure to buy from someone who has a high seller rating, and stands behind their merchandise.
Visit antique shows. These are specific to your location of the country, but there are great websites that track where the antique shows will be every weekend. Search for sites that cover your area and go check them out. It's a great place to bargain with the owners.
Advertise that you love to collect Antique Bird Cages. So many people just want to get rid of "stuff" they might not know, or might not care about what they have. Place ads on community sites and tell people what you are looking for; you'd be surprised how many will come to you.
Hit the yard and estate sales. Part of the fun of collecting is the hunt for the item. At yard and estate sales, you will certainly be on a hunt.