I've been looking for a viable alternative ever since I found out that my city won't be hosting a full marathon this year. I think I'll sign up for this one:
http://www.breastcancermarathon.com/...FUZN4AodDDvq2g

I would prefer something at the end of this year, but it's only 20+ miles from where I live, so I think it will be worth the wait.