Become Lord or Lady of Sealand. Click here to apply. Two titles for $41.
His Lordship the Viscount St. Austell-in-the-Moor Biggleswade-Brixham, aka Doonesbury's Zonker, got his title pretty much this way.
Want to visit your royal lands? There they are, up above. It's an abandoned platform off the coast of Scotland. It has a helipad. Go nuts, your worship.