Does shiplap come in sheets??? Where to buy???
There are many ways to achieve a shiplap wall.
Here are more sites with tips and tricks.
Any lumber yard or home improvement center will have what you need.
Most home improvement stores also carry paneling that is 3/8" thick and mimics shiplap. These are easy to install and will need a sort of trim strip to cover the seams between them. I hope this helps!
Go to your local diy stores, they have panels and planks...Lowes for example.
You can buy pre-made ship lap but it's hugely expensive. You might look into how to recreate it for less with panels cut into strips maybe.
Just trying to be helpful.
Some folks do not have all the requisite tools for diy their own shiplap pieces. For them, purchasing pre-made might be a faster and more convenient option.