If they're more expensive than OEM, don't bother. OEM gasket kit (bowl gasket and all o-rings for one carb) is about $16 each.
For the other o-rings, you'll need somewhere better than harbor freight. Not only are the OEM o-rings a fractional (in-between size) size, but the ones from harbor freight are not alcohol resistant- kind of defeats the purpose of the no-swell gaskets, eh?
64 bucks (or so) for carb gaskets (16*4) seems expensive, but you get what you pay for. I would leave the no-swell stuff on ebay, and use OEM.