title: Softlayer slcli command to create iscsi issue
body: <p>I can't create iscsi storage with the slcli command.</p>
  
  <p>C:>slcli iscsi create --size 50 --datacenter wdc01<br>
  Could not find a valid price with for the given size</p>
  
  <p>C:>slcli iscsi create --size 100 --datacenter wdc01<br>
  Could not find a valid price with for the given size </p>
  
  <p>My package level is SoftLayer (5.0.1)</p>