Action Replay GameShark Xplorer & clone carts ect.. you buy them
Amazon eBay junk shop, they are going to be hard to find nowerdays to be honest
As for codes try 800833A8 FFFF on it's own (it's just cash)
If there are certain code types not working let me know what they are e.g 80 codes (actually those will work with all cheat devices)