The minimum amount of Ethereum you can purchase is determined by the cryptocurrency dealer of your choice. Most dealers set a minimum of $1.00, while others set a maximum of $2.00 of digital currency denominated in your local currency, in this case, US dollars as $1 and $2. Keep in mind that the amount may change in the future. However, in order to reap significant returns, you will need to invest more than the minimum amount. For example, 1-ether is currently trading at 3000+ and is expected to close close to $4000. These figures perfectly depict how small a $1 or $2 ether investment is.