Name of these Nike sneakers?

So, I was in Bob's a while ago and saw this great pair of women's black Nike sneakers and they had a bright blue nike swoosh.. and they were on sale I think for about $40 which is partly why I wanted them so badly..and I went back there today and they are nowhere. I don't even know the name of them all I know is they were Nike and were cheap.. does anybody know what they could possibly be?