1) yes, we are such a supplier (ipe decking only), I need to say that decking other then 19/20 or 21mm is always MUCH more expensive
2) why the difference in thick? I have no idea since 20m is more then enough especially if it is hardwood decking, but some need special superdeck for some misterious reason.
So if you are in need of a large quantity (10,000sqft / 1000m2) do not hesitate to contact us for a very competitive quotation! http://www.roquevalente.com