Shed Repair - where can I source ShipLap boards?

Not sure this is in the correct place, but does anywhere know when I can get 3/4 shiplap boards to repair the bottom few runs on my shed?

i tried the local DIY shops, but nowhere seems to stock shiplap. Any guidance would be greatly appreciated.

 

Wickes seems to stock it.
Wickes - Search Results for shiplap cladding

 

Thanks. Maybe I should ask again in my local Wickes as I couldn't find it and the sales assistant said that they didn't stock it.

 

Go back to Wickes - they do it in two lengths:

Product Code: 120807
Pack size: Single - Width: 121mm: Length: 1800mm: Depth: 12mm @ £4.59 each

or

Product Code: 120809
Pack size: Single - Width: 121mm: Length: 2400mm: Depth: 12mm @ £5.89 each

 

I thought Wickes had different size stores (like Tescos do) so smaller ones may not stock all the products on the website.

 

Available at any builders yard