fastest way to get 49k D bones (99 pray)?

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well as the title suggest's, ive set my self a new goal which is to get 99 prayer. i know this is a hard and costly skill to get, and i dont expect to get 99 in a few days. what i basically wanted to know what is the fastest way to get the bones. what i am currently doing is planting herb seeds and making them into pots, which is bringing me about 200-300k every day. and while im waiting for them to grow i am killing green dragon's, and picking up the bones, and then banking. is their any other way to either collect dragon bones, or to pay for 49k of them? so dar i am averaging 700-800 d bones a day, and all the money from farming and herblore will be spent on dragon bones. at this rate it should 50 days to get the bones, and i estiamte another 30 days actually using the bones on a guilded alter. all comments are welcome thanks