PS2 V12, sensor killers + swap discs...?

Ok, I have never wanted to use a swap modification method for a PS2 and I still dont want to but soon I am getting a V12 PS2 for myself to install a mod chip into (probably a muppet chip). I will be getting a second one once i sell the XBOX I am getting via a trade. Question is, I want to sell both PS2s, one modded w/ the muppet chip and one I want to have the lid sensor killers, so my question is, what do I need to do this method w/ the sensor killers, where can I get them, I don't want to use the ghost switch cuz they say tape or glue a certain peice down, that would look ugly. also, how much are the swap magic discs for the PS2 V12s. If they're like $30USD i might as well get a mod chip, lol.

Thanks.