At the same place where you buy most stuff: the Grand Exchange.
Buy them.
from the ge
You don't. You have to buy it.
yes from the grand exchange
just buy at GRAND EXCHANGE
there are many different sorts, look at this link
Yes, you have to be a member to have a home in Runescape.
To make a rune crossbow you need 69 fletching. Use a knife on some yew logs to make a yew stock. Then use rune crossbow limbs (you can buy them or make them if you have 91 smithing) on the yew stock. You'll then get a Runite c'bow (u). Then use crossbow string (you can make it by using sinew on a spinning wheel if you have 10 crafting or just buy it) on the Runite c'bow (u) and you'll get a rune crossbow.
Sorry you do lose it but you can buy another one
I am not sure were u can buy it at a shop but u can buy both cheap at the Grand Exchange.
You can either buy them from the Grand Exchange, or there is a place in the wilderness where there are a bunch on the ground.
you can obtain strawberries via the farming skill or buy the from the grand exchange