In a response to a Twitter question about why Gal*Gun Double Peace is only available at online retailers here in North America, PQube Games has replied “Because physical retailers like GameStop refused to take it.”
@CptWiggleFuffle because physical retailers like GameStop refused to take it
— PQube (@PQubeGames) August 24, 2016
My take on this is that times sure have changed, back in 2007 GameStop stated they would consider carrying AO titles in their stores. I have reached out to GameStop via Email.