list of minibonds?

Hello Investing Gurus,
I'm interested in diversifying into bonds as I grow older. But investment grade bonds don't pay much. I've read about minibonds (not muni-bonds) that yield upwards of 7% and some in big companies like AT&T and Verizon. I've googled for hours to find a list of them but to no avail. I don't understand why the secrecy. Can anybody point me to a list?

Mini bonds are very risky cause they're pretty much unregulated. Mini bonds are to the bond market what penny stocks are to the stock market.
Here's some info...

http://www.brighthub.com/money/perso...les/46605.aspx

http://www.everyinvestor.co.uk/news/...s-yields-8543/

http://www.lovemoney.com/blogs/savi....nds-lose-money

I'm aware of the risks. Can anyone point me to a list?