What’s the best way to send from a CEX to a L2?

I want to send some ETH from an exchange (coinbase or Kraken) to Arbitrum. Is there any way to avoid the huge fees of sending from CEX to a metamask wallet on L1, and then bridging?

I can be patient – I've heard that Kraken will allow users to directly withdraw to Arbitrum "soon," does anybody know when?