spark plugs

I thought I'd find a wealth of info on here about this but I don't see much. Perhaps I'm looking in the wrong place. I have been looking for NGK double platinum, but for some reason, nobody in my area stocks them. I did find these NGK Laser Platinum plugs at my local O'Reilly store for $8.49...

Wats goin on fellow MK3 Supra owners, i gotta pretty big problem on my hands and i need assitance ASAP! I have a 1990mk3 with the 7m-gte and it has 200,150 miles and its 5 speed. I keep up with regular maintenance so its been workin good for me (im saving up to fix it up but need more money...