Cheapest Place?

[xboxps3gba]

I used to know all of this but i forget so, where is the cheapest place to get a psx external modchip or boot cd. I have the scph 1001.

[dust2dust]

boot diskks are ok but there are certain games that dont work with them
harry potter was 1 pissed many people off,no idea which others as i not follow ps1

u better off buying the latest internal chip,all games will boot,no swapping,most will fit/supply a ps1,cheaper then buying a exchange disc