looks like a nice pony if he is registered the price is about normal im afraid, highlands seem to go for a lot of money these days. you could also try the highland pony society sales list on their website. good luck
Seems like a normal highland price to me, they do go for quite a bit, it does look like a good sort, if on the small side...also good breeding. However it isn't up to height, doesn't say if its actually done anything so seems a tad pricey for what it is!
Actually I would say that it's fairly priced to quite cheap. Decent Highlands go for quite a lot of money. A friend of mine paid £1750 for a well-bred, show quality weanling getting on for two years ago and I nice (but obviously green) 4 year old Highland mare has just sold for £4500 near me.