Are you too lazy to go to the mine to get what you needed to use for the recipe or crafting? Well, just buy it with this mod.
Universal Coins 1.7.2 and 1.7.10 is a mod that adds a ?trading station? where you can buy and sell all kinds of objects and resources. So that for example, we can get those blocks that need obsidian without spending several minutes.
To buy you need to get coins, to get them you have to sell those items that are expendable for you and accumulate coins to subsequently acquire those items that need.

Detail and Download here : Universal Coins Mod

Homepage: Mods for Minecraft