Welcome I see you're new here. At the top of this section there are links to different places that you ca find parts, or at least it use to be there. The best spots I have found would be Driftmotion.com, eBay, Supraforums, Supramania, and clublexus.
You have to remember that many 1JZ parts are also 2JZ parts. Here are a few examples. Front main seal, Rear main seal, water pump gasket for the non-hydro water pump, oil pump, rear sump oil pan, (7M-GTE) valve cover agskets fit the 1JZ, 2JZ are different. Coil packs, Coil pack connectors are the same, and many more items.