The cost and effort of printing duel decks is never going to be less than just buying the product.
But I can also just print 6 cards per page from my black and white laser printer at a cost of up to 8¢ per page, or about 1.3¢ per resulting card (plus cutting them out with scissors). And, this doesn't require an upfront payment of $150+.
So no, I would not say the cost of just buying the product is lower.
The only sane options I can see are:
* Play limited formats
* Play casual with proxies
* Buy individual cards