This is supposed to be a "budget" cube where all cards are less than 3 USD at the time of addition. The mana base is the most expensive part containing good lands (shocks, fetches, pathways). If you remove that and swap out to other lands prioritizing untapped duals, you can reduce the cost to <400 USD. All were using Card Kingdom prices.
I am not sure I will keep this budget restriction, but it was a good starting point for my first cube.
All comments and feedback are eagerly appreciated.