古本屋 is...
HuruHon ya
ふるほんや
古新聞 is...
HuruShinbun
ふるしんぶん
in addition...
古本(HuruHon) = used book
古本屋 = used book shop
古新聞 = used news paper
古雑誌(HuruZasshi) = used magazine
( these are not for sale, for recycle )
But, normally, 'used' = 中古(Chuuko)
For ex. 中古車(ChuukoSha) = 'used car'.