Here are the donation prices on the website. The more you buy, the cheaper it gets. The cheapest deal is around $1=$2K Ecodollars, but it is still lower than the normal market price for donations in-game, which is $1=$3K Ecodollars. Therefore, it is advised never buy Ecodollars with cash or Ecodollars for Ecodollars. $10 - $10K $20 - $25K $30 - $40K $50 - $70K $60 - $90K $80 - $130K $100 - $170K $200 - $370K $300 - $620K $500 - $1.12 Million
He's mainly just looking for a cheap donator feature so he can have donator status and therefore avoid non-donator downtime