you aren't going to get one.. no longer manufactured.. and haven't been for 5+ years.. http://www.modsupplier.com/catalog/ps2-matrix-infinity-se-p-133.html go for one of the clones or a dms4 pro maybe? .. and make sure to install the laser fix listed on the linked page..
read up on the still available clones.. and ALL the slims need a laserfix.. or they die .. there are various methods for each version .. better safe than sorry