For Feng Jun, what he lacked wasn't just the 25,000 Spirit Stones; the "Heavenly Luo Edge" manual was also worth 18,000 Spirit Stones. The total cost for both Cultivation Techniques amounted to 43,000 Spirit Stones.
Even this was at a discount from Chairman Huang Fu, which just goes to show how expensive cultivation can be.
However, it's precisely the cost of these main Cultivation Techniques that takes up the lion's share in cultivation expenses. Once that's taken care of, the other costs can trickle down slowly, allowing for more careful and long-term financial planning.
Feng Jun had previously obtained a "Qingmu Technique" manual from the secret vault of the Wonderful Hand Pavilion's Eastern Sub-rudder, which he later entrusted to Gu Jiahui for her cultivation. Now that he thought about it, murder and plunder really were the fastest ways to make money.