You need to check the species particular needs to know if they'd live.
Also you can check here on AA
Or ( join for free to view sales threads )
The Planted Tank and Aquatic Plant Central. Both should have hobbyists selling Shrimp.
Might be cheaper and easier to ask questions.
After watching my Betta kill Shrimp I will never mix them again.
Also a Betta is NOT an ideal tankmate for CPDs. They are shy and will not appreciate such a giant IMHO
. Mine do come out. The Threadfins get along well with them. CPDs do best with other Nano fish AFAIK.
Pics of my Shrimp and CPD tank are in my sig.
I'd skip the Betta.