Fuel systems aren't cheap
I've not ever done one for a Supra - yet - but I can tell you they aren't cheap for any EFI car. -6 and -10 lines can be gotten from Summit or Jeg's easily as can external pumps and regulators. Mustang for sale boards can be good sources for regulators, filters, and pumps if you don't mind an external one.
I'd question using -10 lines for a feed though, I did this on one car and it took two turns of the key to fill the line! That's a TON of volume. -8 would probably be fine but again I've NOT done one on a Supra yet so perhaps it's really needed. External pumps ARE noisy. I've heard Paxton, SX, Aeromotive, and others and if they aren't mounted in some sort of isolation form they will drive you out of the car as they use whatever panel they're attached to as a sounding board

The car I've got now even had problems with the braided line pulsing and transferring noise to the car! Adel clamps help and should be used every foot or so to cut down on line movement.
Be sure you price out all of the fittings and whatnot - you may be surprisedto find that it comes close to the setups being advertised by others. This has been my experience with systems for other cars. The fuel rail for the Supra appears to be a bit expensive IMO and if\when I get to the point of needing one I may speak to a fabricator. Fuel rail material for most EFI setups is cheap by the foot so the price of the Supra units seems a bit out of line. Sites like Force-EFI can supply oddball parts as can Kinsler but Jeg's and Summit should supply most of what you'll probbaly need.
Oh, and if you source all the parts yourself chances are you'll end up with extra fittings

I've done three systems now and have a whole box of leftovers - it just always seems to happen! Have fun and if you do manage to save a significant amount of money do us all a favor and documnt exactly what you had to buy so that the next guy with your question has someplace to go...