Sully Island is accessible by a causeway a few hours a day
You've bought the Ferrari and the private jet but now you can stay one step ahead of your fellow have-yachts - by purchasing an island.
Sully Island, just off the Vale of Glamorgan coast near Penarth, could be yours for around £1.25m - the price of a decent executive home.
Besides the kudos of owning a 14.5 acre (six hectares) island, you can impress your golf club chums by commissioning your own stamps.
But don't expect a 24-hour stream of party guests to visit because, unless they have a boat, they'll have to take their chances using a narrow causeway accessible only a few hours a day at low tide.
You may also wish to warn your friends that the stony causeway is unsympathetic to sky-high Jimmy Choo heels.
Karl-James Langford describes the archeological features of sully Island which include a bronze age barrow
Estate agents Chris John and Partners, which is selling the land, said it was impossible to gauge the type of buyer it could attract.
Edward Rankin, residential sales manager, said: "Islands for sale are few and far between, certainly in south Wales anyway.
"It's an unknown market place so it's a case of putting it on the market and gauging the interest from there.
"There may be people who have got money and they have always wanted Sully Island and now they've got the opportunity."
And while planning permission for a house on the uninhabited island is highly unlikely, Mr Rankin said some sort of commercial venture related to tourism would not be out of the question.
The current owner, who Mr Rankin said wished to remain anonymous, bought the island through the same estate agents 30 years ago.
YOURS FOR £1.25M
Ten Aston Martin DB9s
Manchester United star Ronaldo's wages for 10 weeks
A two-bedroom flat in an exclusive part of London
One lavish dinner set from UK china firm Royal Crown Derby (plus change)
One journeyman Premier League player
She is selling an island with a rich history which includes a Bronze Age barrow and evidence of a Danish Iron Age fort on the eastern side.
It was also popular with local smugglers during the Middle Ages.
The estate agents pointed out the island was also something of a haven for plants that are not usually found in the area, such as the marine spleenwort.
Sales of islands are not unknown in the UK - celebrity spoon bender Uri Geller recently bought a lump of volcanic rock in the Firth of Forth in Scotland.
And Skokholm, which is three miles off the Pembrokeshire coast, was bought in 2006 by the Welsh Wildlife Trusts, which raised £650,000.