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Type in "communion wafer company" or something similar at google and I suspect you'll find some info. Companies buy the ground wheat and prepare and package the wafers for resale. I suspect that many of the same companies that supply Catholic churches also supply Lutherans, Anglicans, etc, etc.

I asked a friend and he said that St Vincent de Paul society owns companies that will also make them. They have disabled workers making them. There are also regular companies and it depends on the country.

I finally found the site I was looking for.
Excerpt:

Since 1910, the sisters at Clyde have produced altar bread as a primary source of revenue, but in 1991, with many smaller communities facing insurmountable production problems and personnel shortages, an Altar Bread Seminar was convened at Clyde. It was there that the Clyde sisters came to an altruistic decision. They would bake the bread, cut, and then sell it at a wholesale rate to smaller contemplative communities, mostly other Benedictines, Carmelites and Poor Clares. Those smaller communities would then package and sell it in their dioceses.

But market pressures from large corporations, most notably the Cavanaugh Company, the largest distributor of altar bread in the country, continue to threaten what was once almost exclusively the ministry of women religious. Less than 30 religious communities are still baking altar bread in the U.S., down from more than 200 in the late 1960s. Sister Rita Clair Dohn, director of Clyde’s altar bread operation, estimates that today only five percent of the market belongs to women religious.

More here: http://www.conceptionabbey.org/TowerTopics/TTSpring2003/altarbread.htm