Transfer up to 3 Domains (.com, .biz, .net, .org, .ca) for US $1.20 each (Includes ICANN Fee of US $0.2). Rebel.com Domain transfer FAQ states: The transfer fee covers the remaining time left on your domain and the renewal for next year.
GoDaddy were looking to charge me US $19.99 for the renewal of my .com (which I purchased for US $0.99), which is ludicrous as the average price for domain name transfers looks to be approx US $8-9, so not always a wise move to automatically renew your domain name on expiry.
Domain name transfer FAQ can be found here: https://www.rebel.com/transfersale.aspx
As always read the T's and C's when making any moves to a new Domain registrar (looked pretty above board to me). No expiry to the deal was located.
How much does it cost to renew a domain at rebel after you have transferred it?