RoboSats has a Swap page (i.e., buy on-chain BTC and pay via LN, or sell on-chain BTC and receive via LN): https://dex.robosats.com/offers/ <-- Then press the "Show Lightning Swaps" button
Other P2P exchanges have swaps as well (e.g., HodlHodl): https://cointastical.github.io/P2P-Trading-Exchanges/
Thanks for the info!
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