Buy Item(s) [0x3B]

Buy Item(s) (Variable # of bytes)
BYTE cmd
BYTE[2] blockSize
BYTE[4] vendorID
BYTE flag
0x00 - no items following
0x02 - items following
For each item
BYTE (0x1A)
BYTE[4] itemID (from 3C packet)
BYTE[2] # bought