Do not where this fits best but are there any good tips for PIM for more starting sites. Struct and Inriver are great but a bit steep to start with. Obviously something that is a good fit for Umbraco/C# would be nice.

Maybe a Product Tips sub forum? Btw why isn't there a E-Commerce section now that Umbraco has an official package?

There's only 2 channels: anything to do with Umbraco (including products) and anything for other than umbraco. More info about this choice: https://discord.com/channels/869656431308189746/1184062205788954644