u can short a 5 dollar sprd at $3 and your margin would be $2,the remaining width of the sprd,sep spy 105/110 call sprd this morning at $3.15,close $2.75,.40 cents(bucks) or keep overnite,your margin would have been $185 per 1 lot sprd,and your max loss would have been $185 per 1 lot sprd