So other than just grabbing all regular bones and burying them (which takes FOREVER) what is the best way? i hear big bones are good but im not sure if i can handle fighting giants. any advice would be great

what are your levels combat wise?

 

the best way to train prayer is spending a lot of money, just so you know :P

37 attack. 30 str and 30 def. I figured it would be expensive. what kind of numbers are we looking at cost wise?

um mills haha.

 

you can kill hill giants for big bones and combat xp if youd like

kill hill giants, bank them every trip and go to a guilded altar for far more exp than burying.

First of all, don't go around burying bones. Use the bones a gilded altar in someones player-owned house (world 31 is good for this). You'll receive 3.5x xp and save a lot of effort, time, and, most importantly, money.

I would recommend getting your prayer to level 43 so you can use Protect from Melee. The best way to do train prayer is using bones on a gilded altar. There are usually people that will let you use their altar in world 31 (House Parties) if you do not have one. At the moment using babydragon bones is around 8 gp/xp so going from level 20-43 will cost 350-400k. Here is a link to Grimy's Prayer spreadsheet where you can check the prices on various methods.

 

EDIT: Hedge is a ninja.