My son has a "Big Joe" brand bean bag "lounge"
I love it because its made out of a sort of heavier fabric, kinda canvas feeling i guess, so im not too worried about it tearing and spilling beans everywhere. You can find them online but they seem to be a LOT more expensive, where we paid $30 for ours at either wallmart or meijer. they both sell them, but I haven't seen the lounge style in a while. I definitely think theyre worth the $30 price tag.
There are TONS of styles if you google "big joe beanbag" but they only really seem to sell one or two styles in stores.