I don't know what country you are in, but I personally wouldn't buy outside my own country. One of the links was from a seller in Japan.
I would DEFINITELY avoid the "3 lens set"... You really want to find either a genuine pentax lens, or a reputable aftermarket. Sigma, Tokina, Tamron, etc. If you find a particular lens, then search for a review of it. You will probably find something. The sigma might be good since it is an asypherical lens. But, a used lens is going to be a crap shoot.
There are some kits with the 18-135 but they are above your budget. If you live in a large city, there may be a camera shop with used equipment that you might get for a good deal. I don't have a great answer.