Sorry! The biggest width is 2070mm. That is 6.79 feet. However, it is difficult to find in retail shops.
It will not be cheap because it is really rare. What is it use for?
Your father is right. However, DIY is impossible, hence the $$$ will be a 4 digit figure.
The most easy way is to buy a MFC. The maximum size is 207cm x 270cm. The thinnest is 16mm.
MFC is a particle board with thin laminate stick on both side. Laminate means plastic board. The most common colour is copper beechwood and the second is maple. (MFC in Chinese is "double face board", sorry, I can't type Chinese)
The first step is to find this in Bu Lan Street. If you fail and don't mind, I can introduce a quite famous office furniture producer to you. I know they have these board in their factory but I don't know the price. They will cut the board into the size you want and the edge will be sealed by plastic.