Look at
shiregb.com
This will give a guide to what is avail, one thing to note. With all major manufacturers they supply Argos Sainsbury's etc cheap sheds, as well as more expensive buildings for quality, don't buy a cheaper version expecting it to be of the quality standard.
They do nice quality buildings as well, but as wood is a natural product has to be readjusted on assembly and persuaded just like building a wooden model really.
Take care on assembly but these are available in 2" x 2" frame or bigger and shiplap and log effect, good range for the price.
I found in the past I would build a new workshop and it all looks nice and clean, and I could not wait to get started on the building of boats.
But I just could not get going, as it takes about six months to settle in, bit like moving house it takes a few months to get things placed.
IE: Boats on racks, dust extractor under bench, wife in kitchen making cups of tea. !!!!!!!!!!!!!!!! L.O.L