It is possible, but most of the time if you get a free reseller you are forced to place Google ads on every page of the website. This makes your website look cheesy, and also offers your website visitors with other options for web hosting providers. I don't know about you, but I wouldnt want to advertise for other hosts if I want to make a sale.

You can take a look at www.freeresellers.com , there are a few providers there that can supply free resellers.

Another option is www.resellerspanel.com . They offer free reseller packages, but it is more of an affiliate program then a reseller account, as you get a commision from each sale as opposed to buying a certain amount of disc space and bandwidth and reselling it at the price you want.