Clay • B2B Wholesale Lock

Pros:
Free
Intuitive, simple, easy to use
Works as expected
Fast response & resolution
More than just for B2B - it's access control.
Has Built for Shopify badge - a mark of high reliability.

Considerations:
Enough for my simple business needs, but may not be for others.
I have been using this for less than a week, as of this writing. I do not see reason for replacing or removing it in forseeable future.

Conclusion:
Worth trying.
High possibility for strong recommendation