Is there any good sources for pond plants?

What I am looking for is

Dwarf Sagittaria subulata
vallisneria corkscrew

Going to start these in some large pools for the summer then plant in the fall into the pond.

Any thoughts on a good source or other additions to a perch pond with the hopes to start a shrimp population.

Cheers Don.

[Linked Image from corvettejunkie.com]
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7/8th of an acre, Perch only pond, Ontario, Canada.