That price is insane for shipping, for plants?
Find hobbyists online, always people getting rid of stuff clogging up the tank.
Earlier you mentioned amazon Sword. They do great in a pot with soil. They want ferts lots of ferts to be amazing looking.
A less expensive thing and beautiful and easy to care for is Crypts in general, low maintenance for the majority, is Cryptocoryne Balansae.
The long wispy ones are the Balansae (center plant on the DW is also super easy Bolbitis heudelotii).
Edit: missed the pic
This is a 12G Edge tank, back then, I didn't realize they got so long. These grew from a tissue culture.
They look so lovely in the back flowing across the top of the tank, they get long.
You can also buy the tissue culture packs and raise them up yourself, or mix grown plants with the tissue culture to fill in.
Which fish are you wanting for the 20G long tank you found?