Wolf, relax! I was totally startled to see those two weapons you posted, as this is about primitive archery. And this is not a rich boy's club - a trip to the local butcher or slaughterhouse, or into the woods, or by the side of the road, or from hunting friends, etc, can get you lots of materials for little or nothing. That is half the fun. I've never seen any ivory used at all here, as well.
Jaro, a fine weapon! Is that you spanning the earlier crossbow? Very cool clothing and period shoes.