Need help with prices and usage of chips

[Spicules]

Ok, i think ive got it, I used to do PSX mods, but I havent looked at the PS2 until now. But if not , can someone help set things straight?

Here goes:

The chipless mods are unreliable and may cause damage to a PS2...

The Messiah is the chip that plays all imports/backups without a swap or gameshark correct?

And the Origa (or one of its clones) plays imports/backups with the usage of a gameshark, right?

So my question is, what is a descent price for these chips? Ive seen some mods as low as $15 (for a origa clone i think) or as high as $89 (for the messiah). Where is a good place to go that accepts $US and will ship to the US?

Also, can one use a backup of the gameshark? Or does it need to be an original? Ive never used one before, but ive heard you might need some type of memory card to use in conjunction with?

And lastly, I pretty much am interested in the mod for specifically Tekken4. Are there any specific concerns for a backup of this game?

Any help for a newbie greatly appreciated!