I started this addiction to orchids at home depot, lowes, and trader joes
At this point, however, I'm really into my local orchid greenhouses. You get the best quality orchids that really bloom well and are in good health. They're the orchids that really give me the best, longest lasting blooms and best foliage (although I am still a sucker for the occasional lowes orchid. I love to get them home and get them into an appropriate potting medium!)
You may pay more for quality vendors but you get so much more satisfaction raising them. As an added bonus, the price keeps my numbers a little lower!
I personally recommend and have good experiences with Al's Orchid Greenhouse and Oak Hill Gardens.