I need to rent or buy a wheelchair for my mother. Do you know where I can buy a wheelchair on line in Seoul?
I don't know about Seoul, but in Busan you often get hospitals clustered fairly closely together and around them are tons of medical supply shops. That's where I would look first if you could find out where that area is in Seoul
There are plenty available online, seem expensive though, but I have no idea how much wheelchairs cost back home!
Both Gmarket and 11st have their websites in English if your Korean isn't up to scratch.