We roll a d3 to determine the size of the settlement we travel to between adventures. This allows for a varied result on the shopping table on page 19. The result will either be a town (small), city (medium) or metropolis (large). Once the proposed wilderness expansion comes out, we may modify this d3 with something from those rules.

When in the various sized cities, we roll a different number when shopping than the d20.

In a town, roll a d8
In a city, roll a d12
In a metropolis, roll a d20.

This means that we will not be able to buy some of the pricier and more rare items in smaller settlements.

Also when we make the roll to see if an item is in stock, we roll once for each category. The difference between what is rolled and the maximum of the die, plus one, is how many of that item is in stock for the group to buy from as a whole. The reason for the +1 is so that if the bare minimum success is rolled, there is always one in stock.

Example: Heisel the Sorcerer travels with his party back to a town (small settlement). Potions and Scrolls are available on a 3+, regardless of settlement size. He rolls a d8 for the party and comes up with a 6. The difference between 6 and 3 is 3, and he adds 1 to the result, allowing 4 from this category to be available for purchase. There could have been a maximum of 6 total (since a d8 is rolled) available for purchase by the party. This can be any variety of potion or scroll, but each individual purchase is deducted from this total as they are bought.

If the party had been in a city (medium), there could have been a possible total for the Potions/Scrolls category of 10 ([1d12-3]+1).

If the party had been in a metropolis (large), there could have had a possible total for the Potions/Scrolls category of 18 ([1d20-3]+1).

Using this variant, here are a few NPCs the party could meet:
1. A ranger who guides them to a metropolis with no roll necessary, allowing for larger quantities of supplies
2. A merchant or black marketer who gives a +1 or +2 to the shopping roll (respectively), which would allow for greater yields, or even the possibility of access to items not usually available in smaller settlements. 

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