The Nebraska State Fair on Thursday warned of ticket scalping for concerts and shows.

The fair noted tickets are in high demand, leading to exorbitant prices on third-party resale sites. For example, one resale site recently listed tickets for Gabriel Iglesias for $648 each, according to the fair.

The price at StateFair.org through ETix, the fair’s only authorized ticket seller, is $81.

“We want to encourage people to use only ETix.com or StateFair.org to buy your tickets,” State Fair Executive Director Jaime Parr said in a release. “The State Fair has no control on what happens with these third parties except to make the public aware.”

Other examples: The fair said it’s seen Older Nebraskans Day with the Oak Ridge Boys elsewhere for $76, when the regular price is $25.50. Not only is the pricing significantly higher, but the resellers get the concert location wrong. Both Lee Brice and rock group Bush have their shows posted on one site as being inside Heartland Events Center, when it is actually outside at Anderson Ford Field.