Current Attempt in Progress Sheridan Distribution markets CDs of the performing artist Unique. At the beginning of October, Sheridan had in beginning inventory 2,000 of Unique's CDs with a unit cost of $7. During October, Sheridan made the following purchases of Unique's CDs. Oct. 3 Oct. 9 2,500 @ $8 3,500 @ $9 Oct. 19 3,000 @ $10 Oct. 25 4,000 @ $11 During October, 10,850 units were sold. Sheridan uses a periodic inventory system.