I'm very unpatient so it took me ages to learn how to play the bones - now it's my favourite thing
you have to be patient as the basic movement is quite complex - after you'll figure it out it seems simple.
still, what the guy is showing on the website is just a one type of holding the bones.
and they are definitely not Irish, there are folk instruments like that all over the world - in China they use pieces of brass. I've even found something similar to bones in Poland - where trad music was pretty much dominted by a frame drum.
I don't like bones made of ribs as they are very thick and not very confortable to hold
if you'll be lucky you might find on american ebay ebinite bones - they were manufactured in US in 50-ties or something like that. they are very good.
BTW 28e for a pair of ribs is quite expencive - there's a shop here in Dublin in which I've seen a sets like that for 18e - quite a difference.
and I must say that there are very few people that are playing bones here in Ireland. and every time I'm starting to play mine people are interested and sometimes even excited as it is something not very common.
best of luck with them. if you'll need any help give me a shout.