This question could be answered differently depending on what age, size, and gender the pants are supposed to fit.

If you're looking for a discount on new black pants, we like Ross (http://www.rossstores.com) and TJ Maxx (http://www.tjmaxx.com). You can also check out Amazon and eBay if you're looking to buy online (http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=black+pants&x=0&y=0 and http://www.ebay.com/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=black+pants&_sacat=See-All-Categories). 

And, if you're looking to try to get something locally and potentially for free, you can do a search on Craigslist (http://www.craigslist.org/about/sites) or send a "WANTED" email to your local Freecycle group (http://www.freecycle.org) with the specifications for your black pants, and there's a good chance someone out there will have the black pants.

Please post a comment if you've used any of these resources, have any additional suggestions, or have found the black pants that you've been trying to find!