Royal titles to benefit a cause are now for sale: for $180,000, one can become a duke or duchess. The cheapest title is a knighthood, for only $40,000.

The titles are sold online through Nobility.co.uk by David Howe, aka King David of the Isle of Man.

The funds will go to Howe's favorite charity, the Malawi Missions Project to help AIDS orphans in Africa, he said.

Howe, 38, of Frederick, Md., was crowned King David of Mann on March 30 in a Washington, D.C. coronation ceremony after filing a claim with the British government.

He was told by a U.K. genealogist in 2006 that he is a direct descendant of the last King of the Isle of Man who reigned about 500 years ago.

The isle is in the Irish Sea between England and Scotland and has a population of about 80,000. It is best-known for an annual motorcycle race around the island, Fox News reported.

Howe, a small businessman who married his high-school sweetheart, lives in an unassuming home in Frederick, Md., with his pistol-packing queen Pamela, and their princess, 5-year-old Grace. "We're nobody special," he said.