I thought they would have died out last season but one shouldered tops are still holding their own this season. You can find some nice examples at a few of the hottest shops.
I especially like the Kiyoshi Tunic ($78) from Igigi that is actually a convertible top, so if it gets chilly you can duck into the bathroom and put cover up. Or you can wear it as a full top at work during the day and covert it to a one shoulder for the night out. They also have a royal Salute One Shoulder Top ($85) which is sleeker.
From City Chic I found LOTS of cute tops including this One Shoulder Floral Top ($48) and the One Shoulder Stud Top ($46). Don’t be fooled by the sizing in this shop. They are plus size but use small, medium, large and extra large for their size descriptions so be sure to read their sizing info.
And finally from ASOS Curve there is this totally lovely Chiffon One Shoulder Top (£30).