The "yard sale" and auction got underway in the morning at the Reliant Center, the convention centre adjacent to the now-closed stadium. More than 4,000 people were inside or waiting to get in by about 10 a.m. Saturday, Reliant Park officials said, the line twisting through the centre and out the door.
For those looking for a cheap memento, a 12-inch by 12-inch piece of AstroTurf cost $20. Seats were going for $200 a pair, and larger items, including autographed lockers and dugout benches, were to be auctioned off.
Marcos Escobar bought four squares of AstroTurf and two pairs of seats. He recalled fond memories of watching Houston Astros baseball games and Houston Oilers football games there with his father.
"I wanted to come out here and get something before they tear it down," Escobar said.
Opened in 1965, the Astrodome was the world's first multipurpose domed stadium. It was home to the Astros and the Oilers. But no professional sports team has played there since 1999 and has been closed to all events since 2009.
Voters will decide Tuesday whether to approve a referendum authorizing up to $217 million in bonds to turn the stadium into a giant convention centre and exhibition space. Houston-area leaders have said that if the referendum fails, the Astrodome will probably be razed.
A poll conducted in mid-September by Rice University in Houston found 45 per cent of likely voters supported the referendum, with 35 per cent opposing it and nearly 20 per cent still undecided.
With its fate still undecided, Escobar and others filled with Astrodome nostalgia took advantage of their opportunity Saturday.
Lorenzo Fuentes recalled paying $4 for tickets to games as he finished buying four squares of turf.
"I have a lot of big memories of the Astrodome," Fuentes said. He added that his wife didn't necessarily understand, and told him that anything he brought home from the stadium would have to stay in the garage.