the split ones are the way to start one that doesn't grab on right away. I bought one of each the first time and she loved the split one. Finished it up and started on the other, though slower until she got to some of the marrow. Then it was none stop. There are usually a few around the house, as she seems to go in stages on each one!
The price you quoted seems quite high, though the antlers are more expensive than other bones. But since they last so much longer, in the end I think they are cheaper! I paid about $18US last week at Petco for a medium size- not split. The split ones seem to be a bit higher priced around here. I was actually surprised to see them at Petco, but it was the same brand I bought at a dog show the first time.