Where Can I Buy Used Records/CDs,etc.?

Hello, i will stay in Tapei during one week in september. In every country I go, i use to buy a lot of records and cd’s.
I wanted to know if there are shops like Bookoof ( jp ) in taiwan where you can buy a lot of used cd’s for around 5 euros. I dont know anything about the music market in taiwan, but i’m sure there are places where records are sold…Please teach me !!!

In gonguan there is a used cd store not sure abou records though, I’ll have to dig out the flyer for the address