The only place you can buy them is in Florida, in the Harry Potter park or online on Noblecollection.com
Actually the Noblecollection wand for Bellatrix LeStrange is different. I haven't compared the others. The one for her from Wizarding World at Universal is curved like the one in all the movie stills, but the one from Noble is straight and looks completely different. It may be that she had two wands, I don't remember, but you might want to check that before purchasing one.
my wand
You can buy a Luna Lovegood wand from the Noble Collection website
Online you can buy an Albus Dumbledore wand which is the Elder Wand and they will sell it in the park. So yes you can.
They buy it from a wand-maker. Or sometimes they inherit it.
buy one
From me..... £200
you can buy them on ebay.ph
WHAT DO YOU MEAN????!!!!! If you buy a "fake" replica wand, it doesn't matter how old you are!! It's not like it's real and you can do damage with it!!! If you mean "How old do you have to be to buy a replica wand?", then probably at least 18. Or you can get your parents to buy it!
Nope
Amazon.com
Ollivander's is where you buy a wand.
at the olivander's shop, you can purchase the wand for 29.95$ and tax, or buy a collectors wand. (Ron's, Harry's, Neville's, etc)