GNS 430 trainer from Garmin - DCS: NS 430 - ED Forums
RealSimGear - GNS530 | Aerosoft Shop
GNS 430 & 530 Simulators – M1 Sims
Reality XP: Garmin GNS WAAS Simulation | Reality XP is announcing "... the release of the Award Winning 430XP WAAS and 530XP WAAS for XPlane 9. Now featuring Class-B Terrain Awareness and Warning