The second realm pill was made for the Foundation Establishment realm specifically, called the Earth Wave Pill, a sub-Foundation Building Pill that specifically helped with the opening of the Sea of Consciousness during breakthrough from the first realm to the second realm.
Usually, items or pills that helped in any major realm breakthrough were highly sought after, so something like this shouldn't have been sold on a common stall for common prices were it not for the fact that it only partially helped with the breakthrough.
Even then, there would still be a huge market for this in the lower regions with sparser spiritual energy and resources, where the power cap was the peak of the Qi Path. For example, Li Ling's own cultivation family where he came from would certainly have paid a high price for this pill if crafted successfully, for that was a chance to push the old ancestor—his grandfather—to the Foundation Establishment realm.
