Where can I buy Metro Coins?

Hello there, I'm curious about purchasing some Metro Coins but I'm not sure where to start. Could you please enlighten me on the various platforms or exchanges where I can safely and securely acquire these coins? I'd also appreciate any tips or precautions I should be aware of before making a purchase. Additionally, is there a specific time of day or week that's more advantageous for buying Metro Coins in terms of price or market conditions? Thanks in advance for your help!