If it were me, I would just buy the gaskets from from Champion Toyota, or at least the ones that I know would make a difference.
For seals (cam seals, valve seals, rear main oil seal, front main oil seal, etc), I would definitely use Toyota ones.
Many have said that Toyota gaskets are the best, especially for their valve seals and that other valve seals tend to leak.
Now if you are going to use FIPG to help some of the gaskets (not meaning seals, but thin gaskets), those you can pick up elsewhere and I doubt it would be that important what you use, but that logic does not apply to seals, as I have already mentioned.
You can buy everything you need, gasket (and seal) related, for a 7M-GTE rebuild for $310 USD last I checked.
I also don't think they are far from you as well, so shipping would be rather quick, I would think.
Their phone # is at the bottom of this page:
http://www.toyotaworld.com/
Different people will tell you different things as to what gaskets they would use.
Some say use the eBay stuff, one said just use FIPG on many of the fittings, others agree with me. You have to decide for yourself what route you want to take.
Here is another thread where we discussed gaskets before, you can read my post as well as others in that thread.
http://supramania.com/forums/showthread.php?p=40825
As far as piston, I have known good and mic'ed pistons from my own engine that I was going to build with. Let me know if those would interest you.