Try FPMT.org, http://www.buddhanet.net, or http://www.lamayeshe.com
I know Lama Yeshe’s, and Lama Zopa Rinpoche both have lots of teachings you can download, I know the Heart Sutra, the Sanghata Sutra, and Ohm Mani Padme Hung is downloadable there. Also try http://www.thubtenchodron.org … Venerable Thubten Chodron’s site has a lot of teachings and prayers online, downloadable. If you can’t find them in any of those sites you can buy the stuff from snowlionpub.com or wisdompubs.org
Hope one of these yields what you seek.
Refuge, Bodhicitta and Four Vows The Heart Sutra her it is in RealAudio – http://www.surya.org/sounds/gate.ram
The radiant Bodhicitta chant (enlightened mind) innate in
all beings and is uttered, over again or repeated; Bodhicitta is defined as the wish to lead all sentient beings to the heart-mind of Tara…