A few options are out there if you don't want to create your own website (though I highly suggest doing so as it is more beneficial to you in the long run)
http://www.shophandmade.com
A site that allows for completely free listings, they do this by using sponsorship to pay for your listings. You can opt to pay a 25c listing fee and not have sponsor ads in your listings. You also get to choose the amount of commission they receive if your items sell (you can choose 0%)
http://www.etsy.com
A community based handcrafted selling site, pay a 20c per item listing fee and 3.5% flat fee on items that sell.
http://www.artfire.com
They have 2 options a free account with no costs at all but a limit of 12 active items at a time, and a monthly fee based account for $12 flat rate per month (no limit of your items) The paid version does come with considerably more features than the free version.
There are a number of other venues out there as well, but getting online with your own site isn't terribly expensive and honestly doesn't cost more on a yearly basis than an account with artfire.com would.
I would suggest considering the # of items you have available to sell and compare them against the fees from different locations.
Don't write off craigslist as a viable place to advertise your website, or other site from which you sell. Many good leads can be generated from there.
April