Vol. 2 is not an upgrade; it's a completely different product.
The reason you may from time to time see a deal for buying both, Vol 1 and Vol 2, together is the same reason why sometimes you can buy two loaves of bread as a BOGO.
That being said,the best way to know when we are offering deals on our products is to join our mailing list by clicking this link http://eepurl.com/dwn59b
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