ECS want $8 for 4 plugs and $55 for shipping for 1 set.
7 sets lists at $115US. 126AUD. $130 after CC fees or $18.57 per set. Shipped 14,500km

I found carpartsaustralia.com.au
(03)9379 3323
511 Keilor Rd, Niddrie, VIC 3042
info@carpartsaustralia.com.au
I got my Lambda probe from them last year.
They have $8 flat rate shipping per order.

I was going to order this week $4.40 each + $8 shipping from Melbourne. $25.60 all done.
7 Sets
28 plugs @ 4.4 + 8 shipping = $131.20. $18.75 a set shipped 1,600km.

What do you want to do ? Will you help me install ?