I just use these steelbook sleeves you can get on eBay for cheap but they do the job.Lol, I have my entire anime collection stored inside clear PET box protectors, the same as what is used for steelbook protection - any Bluray or DVD set less than 20 mm wide in my collection I have covered - about 500 of them so far.
Oops, looks like I missed two sets on that lower shelf! Ha, I just had run out of the proper size for those at the time - they're both covered now. It's actually time for me to order about another two hundred protectors; they come in 5 different widths for Blurays, and two for DVDs.
SW2 Premium Blu-ray Jumbo Steelbook Protective Wraps / Sleeves (Pack of 25) | eBay
Those box protectors look decent though.