There might be some actual, helpful solutions to the customer given you are facing a customer trying to save a buck:
1. Actually giving them a discount: Providing a discounted license. Giving them a student discount. Providing a reduced/lite mode/ad-enabled license (for example, powered by... on the printed cards). Providing WinRAR-style functionality. Extending their trial period. Actually offering them a way to email you to ask for a free license and explain why they can't afford or pay for it.
2. Showing a cheaper (but inferior, possibly) software/solution that does the same thing as the thing you're trying to sell.
3. Showing the customer a way to DYI.
After trying 2 or 3 and the customer concluded to themselves "fuck it, it sucks even more for me to try saving a couple of bucks than to buy this outright," then there is a chance they might actually be happy to buy it.