While it lasts, I see the complete Perez card set on Ebay. It was published in 1984, about 2 years after Perez's JLA run ended.
http://www.vaultcollectibles.com/2016/07/07/george-perez-signed-justice-league-post-card-set/
By my account, the $50.00 offering price is prohibitively high.
But it's a relatively scarce item, so that may or may not be a fair price for it.
