I imagine you could google "buying panties for men" and find some sites. I wear womens panties daily and get most of mine at 99 cents stores. There will be no one to help you and you will have to look through the racks. If you are patient and take your time you can find some nice ones. At last count I have 71 pairs. I like ones with lace, ruffles, bows and tie sides in feminine colors such as pink, lilac, light yellow, etc. The sexier the better. Most of mine are thongs, but have g-strings and bikinis, too. I would try the discount type stores and save some money. Good luck and I hope you enjoy wearing your panties as much as I do mine.
Go to Target/Walmart/Kmart
HommeMystere has ladies style lingerie panties for men now with bras and camisoles available mid June.
Www.hommemystere.com.au that only sell panties and lingerie for men is opening in May 09. Not sure about bra's though. You could contact them I guess
What the heck? Ok that sounds a little weird. I have no idea were to buy them but that is just 'wth?