From the update:
We've appreciated your input and have been evaluating your requests for additional pledge levels. So we created two new pledge levels.
The first new pledge level is called the SAMPLER SET PLEDGE and gives you the opportunity to get one of the basic add-on sets (water tiles, swamp tiles, cracked mud tiles, sand tiles, or grass tiles). Only Basic add-on sets are available for this pledge level. The pledge is $19
If you double the pledge you can choose two basic add-on sets and if you triple the pledge you can choose three of the basic add-on sets in the combination of your choice.
The second new pledge level is called BUILD YOUR OWN SET PLEDGE and gives you the opportunity to design your own base set from four (4) basic add-on sets mentioned above. Again in any combination of your choosing. This pledge level is entitled to purchase any of the other add-on sets of your choice. The pledge is $76.
NOTE: The SINGLE SET PLEDGE is still the best value if you're counting hexes but if you're wanting to design your own base set, BUILD YOUR OWN SET PLEDGE allows you to select the tile textures you want most.