I guess I should be asking how much I would expect to pay (at an average price for the quality of speaker cable that is produced) for the finished version of these cables.Nicely put! I can only answer that question regrading a particular cable -- not in absolute terms.
I use diy cables. For both ic & spkrs. My case is unusual in that diy replaces an expensive model fm a popular brand (Nordost Valhalla).
As to Chris Venhaus: he's an audiophile and much of the stuff he offers is very good (caps, for example). But, @$18/ft he's not the cheapest around; Mapleshade for one, is cheaper.
I would suggest you diy your IC for the time being.