How does one get AVAX to pay for gas on C chain?

I’m interested in porting a project I am building for ethereum onto avax. The bridge process seems no more difficult than moving to Arbitrum. However, how will users get the avax to pay for gas? You can’t buy it easily in the US, even if you just want $50 worth.

Avax is on Coinbase
Send to https://wallet.avax.network/ where you can send AVAX from the X-chain to the C-chain
Send to MetaMask
Read about the X P & C chains first