Hi. Looking for SPR-4 crystals for 18, 21, 24.5, 28 and 28.5 mhz. Will buy outright or have several BC/SWBC and other general coverage crystals for SPR-4 to trade. Will consider junker if most crystals present. And appreciate knowing whether anyone has ordered SPR-4 crystals lately, from whom and about how much? Thanks and 73 Scott