Asking price includes free shipping to Continental 48 and no PayPal fees. Two pairs (four individual adapters). Retail for $600. These work great -- they fit between your RCA interconnect/cable and the RCA socket on your amp/preamp/phono stage/etc. Give the magnets a few days to magnetize your system and you will hear a positive difference. Asking $275 for both pairs or $150 for a single pair.