Cold sintered, Li2MoO4-based ceramics have recently been touted as candidates for electronic packaging and low temperature co-fired ceramic (LTCC) technology but MoO3 is an expensive and endangered raw material, not suited for large scale commercialization. Here, we present cold sintered temperature-stable composites based on LiMgPO4 (LMP) in which the Mo (and Li) concentration has been reduced, thereby significantly decreasing raw material costs. Optimum compositions, 0.5 LMP-0.1CaTiO(3)-0.4K(2)MoO(4)(LMP-CTO-KMO), achieved 97% density at <300 degrees C and 600 MPa for 60 minutes. Raman spectroscopy, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray mapping confirmed the coexistence of end-members, LMP, CTO, and KMO, with no interdiffusion and parasitic phases. Composites exhibited temperature coefficient of resonant frequency similar to-6 ppm/degrees C, relative permittivity similar to 9.1, and Q x f values similar to 8500 GHz, properties suitable for LTCC technology and competitive with commercial incumbents.