Pricey spark plugs

[Vitesse39]

I need to replace the plugs on the ZXR750.

I want to use the NGK irridium ones - these normally are a tenner each. :yikes:

I've seen an add on ebay for sets of 4 for £19.99 or so, excellent thinks I, but is this too good to be true. :scratchchin:

This is an add that keeps re-apearing so it doesn't immediately look like anything iffy, has any one any experience of this ad or thoughts about it?

[s2ooz]

I used to sell the iridium ones at 8.99 each, but no one bought them, so I went bust.

to be honest, there isnt a great deal of improvment over normal ones.