Looking for Module. Password protect B2B site. (no username required)

[surlaplage]

Hello All, Perhaps someone here can help please.

 

Have a B2B site and would like to restrict access to the general public.

 

Ideally a splash screen or pop-up that would  require only a basic password (not a username) to access the site and view pricing.

 

If they choose to  purchase and checkout then they must complete the full log in/account creation process.

 

 

Any ideas or suggestions?

 

Thanks in Advance