I bought a nice used pair of the Holley List 4224’s from a local guy about 5 years ago for $400/pair. I thought that was pretty reasonable price at the time. Since that time I’ve occasionally seen other pairs for sale for roughly the same price or up to around $500/600 pair, and it appears they tend to sell at that price point, but that’s just a casual observation on those. Holley discontinued making new 4224’s a few years ago, I haven’t checked to see if they’ve resumed production, I assume they’re still not available new, so that may have driven the price of used ones up some. Hope that helps.