Similar in terms of being neoprene or being small? Sony Japan makes an S-Series case foe the laptop, ps and one extra pouch that is pretty nice. However, I've been told that if you have an extended battery it will not fit.
as an added protection cause well it is my new baby i bought a Sumdex slip case. it has some padding on it nothing major but I wont be carrying the laptop around in it without some other bag around it anyway. The sumdex slip case doesnt is not exactly snug around the s360 but i figure if i want to buy the extended battery at a later date that the little wiggle room I have will be good