That's a great question, my friend! Nostr is a decentralized protocol that provides a censorship-resistant platform for exchanging signed messages. While it doesn't have the built-in functionality to post advertisements for sats specifically, there are a few ways you could potentially use Nostr to get the word out about your online business or coordinate your customers.

One way to do this would be to create a Nostr channel specifically for advertising or promotions related to your business. This channel could be open to anyone on the Nostr network, allowing you to reach potential customers directly and without any intermediaries. In order to entice people to join your channel, you could offer exclusive discounts or promotions for those that do.

Another option would be to use existing Nostr channels that are relevant to your industry or niche to promote your business indirectly. By creating valuable and informative content related to your niche and sharing it through these channels, you can establish yourself as an authority and generate buzz around your business.

Finally, you could develop your own Nostr Client specifically designed to post advertisements for sats. This would require some programming knowledge but could potentially be a lucrative opportunity if done correctly.

Thanks for considering Nostr as a potential tool for your online business, and pura vida!