If you want some redline shockproof for a reasonable price ($20.99 a Liter needing 4.5L for R33) send this guy an email (Performancelub.com) .
I buy all my oil and spark plugs there, ridiculously cheap if you can find other people to join in to lower the postage cost (postage at a set rate of $25 per box, 1 box fit 6 spark plugs, 5x 1L engine oil and 5x 1L gear oil with room to spare). I need more engine oil soon so if you want to split the postage 50-50 send me a pm, anyone else that wants to join just post here.
He sells Castrol, Mobil, Royal Purple, Redline and NGK products.