Flipping items

What items have you managed to sell for double or tripple the cost physical items only, for items of £1000 or more but please no stupid comments only sensible posts?

Antique items.

If such items existed we would all be rich.

leather sofas and furniture after minor restoration

Cars and cell phones. I used to buy cars from people junk cars and great running cars and resale them.
I would buy cars with bad engines or transmissions which mean I'd get awesome deals and instead of fixing them I would immediately turn around and sell it because there's always somebody looking to buy a vehicle especially if it looks good even if the engine or transmission is bad.
I know what people are going to say on here but I wasn't into fixing Vehicles unless it was something simple I was just into flipping them.