I am not aware of an storage cabinet designed specifically to house LC columns. Besides the desk/lab drawer approach you describe, columns can easily be organized and stored in a 2-door vertical cabinet that is most often seen near photocopiers (for paper storage). Your office supplies retailer will have cost-effective options as will your lab furniture/supplies vendor (e.g., VWR, etc). The vertical doored cabinets are a bit more convenient so you can read the label on the end of each box when columns are stacked.
A quick search revealed these sort of options.