
As this is a breed that has small litters, it would really help if you showed that you were "worthy" of a show quality pup. Go to some breed shows, and make friends with the people showing. You will get a feel for the right people, and soon see which lines you like best.
Any adverts for this breed, I would guess are probably not from show lines. Most reputable Pom breeders will not be advertising, as they will have people waiting for a pup, from a bitch that hasn't even been mated yet.
If you genuinely want to show, you will definitely need to go on a waiting list. Show Poms are not 10 a penny!

I would expect to pay £800 - £1,000.