brushed hub motors with disc brakes and series hybrid controllers?

Try this: Hub & Wheel Motor Controller | Lithium-Ion Battery Charger
Otherwise , Google and Ebay...These days everyone makes that stuff and launching new models frequently so it's hard to get some mass feedback about one model in particular. Chinese have best offers (problems with support and time of reaction), others aren't immune on that too , but more expensive. Luck(personal) , also , has something to do with that (one mane praise some manufacturer , other resent it , because of different experiences with shipping or support or promised performance..). It's really matter of extensive research and personal decision.