How can I get rid of Mary kay inventory for 50% off quickly?

You could try Ebay or Craigslist to sell it. Since it is around the holidays people may be more apt to buy something like that. Otherwise, I do not know anything about Mary Kay products. Do they make anything organic or all natural? If so, I would probably buy some haha. Otherwise, the internet or maybe putting up flyers or something?

if you have any consignment shops in your area you might could have them offered at one... set your price accordingly as they often take 24-30% of the sale price.

I would check out the "I Sold It On Ebay," web site.

I would try selling it on ebay. You could also try sending it back to the company if it has been less than a year since you purchased it (they give you 90% back). If that fails, there are companies that purchase Mary Kay lots from people going out of business!