Mod chip..Where?How Much?

[WildDark]

Hey, some advice need again..

i picked up a PS2 real cheap and i never realised how EXPENSIVE it can be asking a shop in central london would be to mod a PS2!

So i need some advice..

i want a Missiah 2 Pro and i want it installed (im sure id only burn down my house if i tried it my self...or worse break my PS2!)

so how much should i be looking to spend....

Anyone know any good shops ANYWHERE in or around london that can do it on the spot?

PS2 is SCPH 30003


THANKS for the help


Pioneer 105
P3 800Mhz (soon to be changed)
812 SDRAM
80GB 7200 IBM