Have you guys visited The Sino-Platonic Papers website? Every book/paper there is free. You may be interest in some of the following works, especially spp131/173/234.
http://www.sino-platonic.org/complete/spp103_chinese_tattoo.pdf http://www.sino-platonic.org/complete/spp104_chinese_astrology.pdf http://www.sino-platonic.org/complete/spp121_dicing_divination_china.pdf http://www.sino-platonic.org/complete/spp131_chinese_dynasties_western_region.pdf http://www.sino-platonic.org/complete/spp141_chinese_calendar.pdf http://www.sino-platonic.org/complete/spp144_han_dynasty_buddhism.pdf http://www.sino-platonic.org/complete/spp157_chinese_warfare_divination.pdf http://www.sino-platonic.org/complete/spp158_chinese_tomb_warfare_writings.pdf http://www.sino-platonic.org/complete/spp160_han_funerary_art.pdf http://www.sino-platonic.org/complete/spp173_chinese_dynasties_western0206.pdf http://www.sino-platonic.org/complete/spp234_Guaiji_Guiji_Huiji_Kuaiji.pdf http://sino-platonic.org/complete/spp242_china_mediterranean.pdf