I'm still in the house but I did install an extractor hood and ducting to take the steam out. I also rebuilt a shed I got for free.
The floor, roof and about the bottom 1ft was rotten so had wood delivered to remake it. After doing that and felting it I don't think I would buy a ready made shed ever again. Easy to make one.
Most of the cheapy sheds from the likes of B&Q are at best a very thin shelter. The floors and roof are usually 9mm OSB so if they get slightly damp they fall apart, and I've seen thicker fence panels than their sides.
I used 22m OSB on 50mm battens for the floor close spaced, and 12mm marine ply for the roof. The sides were already tonge& groove weather boards so basically followed the original design.
I scavenged some window material from the council when they were replacing bus shelters. I asked nicely and they let me have a sheet free. Got some free colourful graffiti too.
One thing to consider very carefully is the size as if you get it right you don't waste much at all- so design it using the length of wood available. I made some raised beds last year that were 11ft x 7ft - because the timber came in 18ft lengths - no waste!
So consider making one if you are looking at prices.