The latest ALDI catalogue has an art storage box for $20. I've seen similar (but 2-3cm smaller) ones for a much higher price. For example, $37 for a Mont Marte brand one at my local variety store and $70 for one at Riot Art & Craft.
A lot of people have had success modifying these cases to store components for board games with lots of expansions such as Dominion. Here is some discussion around a similar (but taller) case available in the USA:
https://boardgamegeek.com/thread/831335/storage-case-dominio…
I purchased the ALDI one today and I found it to be a fantastic size to store my Dominion cards (see my post on page 12 of that thread).
Edit: ALDI have 2 different art cases available, I'm specifically talking about the one with the larger footprint (but not as tall). It's picked up the wrong picture for the preview and I haven't worked out how to change it.