yeh there are many hosts that allow a reseller to resell again. i don't know of them all but i think one good one is noc24.com u might have to re-check that url but im pretty sure that's what it is.
they have some good plans and reviews.
only thing is im not sure if they allow to re-sell with whm/cpanel u might have to ask..
Selling reseller accounts from within a reseller account is a recipe for disaster IMO, especially with overselling enabled. Not to mention it would be an administrative nightmare. If you really need to offer your customers reseller accounts, I would look at one of two solutions:
1 - find an inexpensive (I didn't say cheap, I said inexpensive) dedicated server - preferably one that includes REAL full management if you aren't familiar with running a server of your own.
2 - find a host that offers reseller packages that has some type of affilliate program, or better yet find someone that will offer you wholesale rates on their reseller accounts. If you find someone that will sell to you wholesale, you can just concentrate on sales and basic support and let them handle the rest.
Rob Tyree Versaweb - DDoS Protected Cloud and Dedicated Server Hosting Fiberhub - SAS70 Type-II Colocation in Las Vegas and Seattle