I'm a bit late to the party with this but I've been using a couple of these bags from Decathlon for transport and storage of my two most used boards. They're reasonably cheap at around £10 a pop and I've found they're great for if you want to travel a bit more discretely on public transport etc. Build quality seems ok just for light travel and keeping them covered, the strap isn't the most comfortable but it does the job. They have a little zip pocket for a skate tool too.
They're advertised as: Decathlon / Oxelo Waterproof Skateboard Transport Bag SC100 for anyone after one of them.
At home I have my boards/spare/old decks leant up against the main hallway like so (temperature is fairly stable in this part of my place) and I've not had any major issues so far: