Both of those are very common pond plants. You should be able to find both of them locally, and not have to worry about shipping cost or damage due to shipping. Anacharis can be found at any fish store and parrots feather at most garden centers that even dabble in ponding.
I've never ordered plants online, so I can't help there. The only reason that I would order online for a plant is if it were hard to find locally. YMMV though, of course.