Shop for 8 string parts. Necks, Electrics...

I've seen a few RGA8 necks on eBay for around $200 - $300 USD a while back, none now but some might pop up from time to time. The ones I've seen were from RGA8's that had the bodies damaged, but I'd check up on the marketplace here and maybe eBay from time to time to see if more pop up.
Sorry if I wasn't much help Best of luck to you!

 

I found an RG8 neck on eBay but the price is kind of outrageous.

Ibanez S8 Wizard II 8 5 Piece Maple Walnut Neck with Tuners | eBay

160 + shipping for a used neck with a damaged truss rod? I got my entire RG8 for 260 bucks hahaha

 

If you keep your eyes open every now and then Kurt from Rondo music will throw a take off neck up for sale on something that came back all janky, I really doubt he'd be very interested in just selling a neck otherwise though (although some member on here got one for kurt in the 50$ ballpark quite some time ago)

maybe if people showed enough interest in just the 8 string neck's we could convince someone like warmouth to start making them

 

Carvin sells 8 string necks. Not sure about the fit for the ibby's right out of the gate though.

 

I'd contact ebay seller loudestbass01. Ive purchased 2 replacement 7 string ibanez necks (one kts) from him that came in factory packaging and untouched. I know he's posted an rga8 neck before because it was hard not to buy it…

 

this guy will also make you a neck for about what carvin is asking

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