Nope.

This isn't as common as the west seems to think, panty vending machines are only really seen in "red light" districts within the city and in hidden areas.

I haven't, but I can't say I'm completely weirded out by the idea. I mean, I'd be making money off of something I have to do anyway (I hate going commando). And, as long as no one knows my identity, there's really no harm in it.

DNA, is the reason I don't do it, too! But there is a market in it. I remember reading about a granny who was investigated for child abuse because she was selling her teenage granddaughter's used panties.

Warning, don't read the following if this topic really bothers you!

They both had a business where they'd buy whatever type of panties were requested by their clients & then the girl would wear them for a 1/2 hour, (I think) & then they were packaged up. The teenager would get home from school & do this as she did homework until their orders were filled. Some people wanted the panties to be worn during exercise & some wanted them worn for longer, but granny just lied about the ones worn for longer, although the girl did exercise in them if requested. They were making a lot of money until busted. But after the girl turned 18, they started up again due to the easy money.

Apparently the people who want the used panties find it difficult to not be "ripped off" by sellers who send them unused ones, ones not as "aromatic" as they want or whatever.

I don't know why people think this is really all that gross, nasty or disgusting. I'm not talking about the example I gave, I'm talking about consenting adults. I don't find this any more gross than anal sex, rimming or even cunnilingus. So what if someone likes to smell or jack off in a pair of worn panties? In the scheme of things, it's just another kink, just not as well know to some. Somebody has to supply the used panties.