Rich's Bettercreme liquid is available online, google Rich's Bettercreme.
The liquid Bettercreme is also available at GFS (Gordon Food Service.
The Ready to Use (prewhipped) Bettercreme is available in buckets from Sam's Clubs that have bakeries. (You have to go directly to the bakery part and ask.)
Costco used to sell it in liquid form online to their business customers, but I don't they do that anymore...
Sysco sells liquid Bettercreme in bulk:
Bakemark trigal dorado:
Crema Para Batir Tipo Chantilly
Pastry Pride - Have never been able to find info on these products, but they seem to be the closes to RBC
Although I don't know how shelf stable they are..
Whip 'n Ice: