Yes, that's the price to club members so you'd be well advised to join for that and the other GRP parts and mechanical spares available.
There is the steel option but the one I have in mind - which is as new and still in transportation primer - would cost more than a pair of GRP ones and a GRP front end combined. I've seen and examined at close quarters a car fitted with Alun's GRP panels and the fit is superb. You simply can't tell by looking that they're not steel.
Another option, and one that would save you removing the rest of the wing if it's otherwise good, would be to cut a repair section from a scrap car and weld that in.
Good luck with this and please, keep coming back and asking questions. It's what we're here for.
