Some Barad texts that you may be able to find:
For those who are staff or students at the University of Westminster, Meeting the Universe Halfway is now a e-book in the library catalogue.
Barad, K. (2014). Diffracting diffraction: cutting together-apart. Parallax, 20 (3), pp.168–187. Available at: http://www.tandfonline.com/doi/abs/10.1080/13534645.2014.927623 [Accessed July 15, 2014].
Barad, K. (2011). Erasers and erasures: Pinch’s unfortunate “uncertainty principle.” Social Studies of Science, 41 (3), pp.443–454. Available at: http://sss.sagepub.com/cgi/doi/10.1177/0306312711406317 [Accessed July 17, 2014].
Barad, K. (1998). Getting real: technoscientific practices and the materialization of reality. Differences, 10 (2), pp.87–128.
Barad, K. (2012). Intra-actions. Mousse, (34), pp.76–81. Available at: http://www.academia.edu/1857617/_Intra-actions_Interview_of_Karen_Barad_by_Adam_Kleinmann_
Barad, K., Dolphijn, R. and Van der Tuin, I. (2012). “Matter feels, converses, suffers, desires, yearns and remembers”. Interview with Karen Barad. In New Materialism: Interviews & Cartographies. Ann Arbor, MI: Open Humanities Press, pp. 48–70. Available at: http://quod.lib.umich.edu/o/ohp/11515701.0001.001/1:4.3/–new-materialism-interviews-cartographies?rgn=div2;view=fulltext
Barad, K. (1996). Meeting the universe halfway: realism and social constructivism without contradiction. In L. H. Nelson & J. Nelson, (eds.) Feminism, science, and the philosophy of science. Dordrecht: Kluwer Academic, pp. 161–194.
Barad, K. (2007). Meeting the universe halfway: quantum physics and the entanglement of matter and meaning, Durham: Duke University Press.
Barad, K. (2012) On touching – the inhuman that therefore I am. Forthcoming in The Politics of Materiality edited by Susanne Witzgall (revision of differences article published in 2012. Available at http://womenstudies.duke.edu/uploads/media_items/on-touching-the-inhuman-that-therefore-i-am-v1-1.original.pdf
Barad, K. (2003). Posthumanist performativity: toward an understanding of how matter comes to matter. Signs: Journal of Women in Culture and Society, 28 (3), pp.801–831. Available at: http://www.jstor.org/stable/10.1086/345321
Barad, K. (2010). Quantum entanglements and hauntological relations of inheritance: dis/continuities, spacetime enfoldings, and justice-to-come. Derrida Today, 3 (2), pp.240–268. Available at: http://humweb.ucsc.edu/feministstudies/faculty/barad/barad-derrida-today.pdf
Recordings of a Google Hangout posted by Angela Bennett Segler discussing Karen Barad’s book, Meeting the Universe Halfway. See Angela’s Google+ Archive
In chapter six, Barad reads ‘diffractively’ Leela Fernandes’ notion of the structural-discursive relations of power, as articulated in her book, Producing Workers, and an agential realist understanding of material-discursive relations of power through each other (Barad, 2007: 226)