What is the alternative solution for the discontinuation of Quickbooks Commerce?

Several of our clients are exploring a 3rd party inventory management app with similar features (e.g B2B portal) to replace QB Commerce and integrate it with QBO. The plans are $67/month for 3 users and $125/month for 8 users. I believe this app is one of the cheapest options available in the market. They also offer data migration services from QB Commerce starting at $40.