You can also go to second hand furniture shops. I found Briscoe a wooden day bed-couch-futon looking thingy for 35 dollars. Its about the size of a love seat but a little lower to the ground... and had the most GOD AWFUL cushions on it (nothing a blue clearance twin size fitted sheet from Kmart couldn't fix). Briscoe absolutly loves it. He lays on it an looks out the windows in my sunroom all day long.
And I got cheap throw pillows from Big Lots and a cheapy comforter thing from Goddwill to put on it, too. Briscoe knows its his bed and if anyone sits on it, they have to deal with him scooting them off the couch over time.(he's got a big butt)