订阅以下载
Tile Purchase Reduced

Cost for purchasing new city tiles reduced.

The base cost for purchasing the first ring of tiles from the city is reduced from 50 to 35.
The base cost for purchasing the second ring of tiles from the city is reduced from 75 to 50.

Changing this mod:
C:programfiles:steam:steamapps:workshop:content:289070
This is where all your subscribed mods are held.
Click the folders until you find the one with TilePurchase.modinfo and PlotParameters.xml.
Right click and open(edit) the PlotParameters.xml file (notepad or notepad++ will do).
You will see this code ->
<GameData>
<GlobalParameters>
<Update>
<Where Name="PLOT_BUY_BASE_COST"/>
<Set Value="35"/>
</Update>
</GlobalParameters>
</GameData>
Simply change the line <Set Value="35"/> to what the start value you want.
eg <Set Value="25"/>, Save it.

NB: I don't fully understand where the math function / parameters are for the last tiles or how the tile cost will scale for city distance from the capital.