Buy at your own risk. Too many Chinese knock-offs listed on eBay. You'll find stories on line of people that have had bad experiences with cheap coil sets they've gotten off eBay. Nothing worse than having one of them fail without warning and leaving you stranded.
Personally I have no problem buying things like air filters and trim parts off eBay, but anything electrical/electronic would be a no go. BTW,
www.rockauto.com is an advertiser here on NICO and they have offered member discounts. They have a good selection and decent prices on coil packs. I'd see what they could do for you.