Getting ready to buy my (used) car now. Would like to get some final strategic thoughts and observations from people smarter than me (in other words, everyone feel free to jump in). -I have heard that one good buying strategy is to locate the car you want at a handful of dealerships, then call them up, tell them you're shopping for quotes, and make the dealers bid against each other. Then take the lowest quote, get it in writing, then take it to the dealer and go from there. Anyone tried this approach? -If I buy a used car from a certified-car place, do I still need to have a third-party mechanic check it out on the spot, or can I have it done during the initial 30-day "lemon warranty" period? -Should I conduct the trade-in on my old car as a separate transaction? Thanks!