Being a Chi owner myself I have to agree they are a really special breed. most people don't know them and pass stupid judgments like.... they are not really dogs, they are toys or people think they're yappy and stupid little dwarfs

..... All of this can't be further from the truth. They are extremely smart and very lovable. You have never been loved till you were loved by a Chihuahua. They absolutely make you feel like you're not only their guardian and their friend, but their god. They do seem delicate and fragile, but if bred well they are quite hardy and very healthy!
I talked (and visited) a well known British breeder last summer and he told me that there in fact loads of Chis in UK and puppy prices not so long ago were around 500GBP, but it all changed over night. There are more Long coats than Smooth coats (this is the official name for short coat Chi) in UK, while here in Continental Europe it's about equal I'd say.
Unfortunately all this popularity caused many people to breed unregistered dogs which results unregistered litters and they actually manage to sell them for 1000GBP!!

But I guess things will not change until there are people naive enough to buy those puppies.......
Basically, go out there and research the breed...... and most of all, don't just buy the first puppy!! go to a reputable breeder....