Different houseplants easy to care:
Flower plants: Celosia, Marigold, Petunia, Begonia, purple hearts- $4 each
Succulents: Jade, Aeoniums, Kiwi, Jelly bean. Pine tree, Ice plant, elephant bush, sedum, Crassula sp, Eschaveria, Aloevera, Climbing aloe, Hedgehog aloe, Hawthoria etc
Other houseplants: Anthurium, Spider plants (solid green and variegated)
Prices vary with size ($3-$40), Pick up near Midtown Palo Alto or can be delivered within 5 miles distance :)