Wal-Mart ;)))
An aloe plant! Serves two purposes....one, it's a plant....two, it's a plant that soothes burns!
A little palm tree! I've always wanted one :)
In my opinion, they're pretty affordable (I've seen them <$20). Depends on the kind you get, of course, and the maintenance cost obviously varies.
They're lasting and beautiful for sure!
An artificial one.
One of our sons gave us an orchid in a pot about 20 years ago. While it's flowering we keep it indoors, when it's not it lives in our greenhouse.
It has not only thrived, it has had pups, and we now have three orchids in three pots, where only one existed before.
I'm with Angela on this, an aloe vera plant. If you put them outside in the hot summer they grow really big, then bring them in during winter. I do that with my palms too, watch for the palms, make sure they haven't got any fungus.
Pink nymph cactus. At least, that's what I use
Just to warn you, they're often sold with artificial flowers glued to the space at the top of the plantFicus benjamina or Benjamin fig, or Weeping Fig is a good plant for indoors. Had one in my office for years before I retired, and it seemed perfectly happy living in in the toxic atmospahere of a HR office.