Anyone know of a cheaper way of getting inbound liquidity than options like flow from voltage.cloud?

Want to add a lightning option to btc pay server checkout but probably won’t make enough sales per month to justify 12-15$ a month to run flow or something similar.

I have set up a store with on chain payments only at the moment which is fine for large purchases but would be nice to use lightning to avoid the on chain fees.

I feel stuck between me paying a monthly fee for a hosted Lightning node or pushing the fees on to customers for on chain purchases.

Any good advice would be greatly appreciated 🙏