dont worry...for one im a firm beliver of the puppy thats ment to be with you will find you...
for 2, i personally wouldnt buy from this breeder, iv have yet to meet an ethical breeder who relases their puppies before 8 weeks old...and 6-8 weeks is a big difference...if the puppies only 6 weeks old it realy shoudl still be with its littermates interacting and learnign how to be a happy well adjusted puppy...
plus if the "breeder" suddenly increased the price on the puppy after giving you a set price then id be worried about it being a scam, i have also never met an ethical breeder who SUDDENLY changes their mind about how much a puppy costs, the only ime ive seen it done is with a puppy thats showing show potential in which case the breeder might keep the puppy a little longer to see how it starts to fill out, then they might charge a little more or a little less depending on how the puppy grows.
a "vacation" for such a young puppy would probbaly b way too stressfull, the first few weeks at the very least shoudl be spent in your home where its oging to grow up ad liv in a calm warm and loving environment, not in some hotel room somwhere alone and bored while your off enjoying your vacation...
id wait a little while, keep looking, the right one will come along in time!
PATIENTS is the key when it come to Anything to do with puppies!