This is sent by the client to buy items from a vendor. This is sent by the server to remove the list.
Offset Type Name Description
------ -------- ---------------- ------------------------------
0000 cmd
0001 USHORT blockSize
0003 UINT vendorID
0007 BYTE numItems Setting this to zero will remove the gump.
for each item
{
BYTE layer usually 0x1A
UINT itemID from 3C packet
USHORT amount # bought
}