Scheduling an LSAT before getting previous test score back

I took the June LSAT this year and did pretty well, but am retaking in Sept to hopefully increase my score by a few points. Though I have been studying, I want to have a back-up plan in case I do not increase my score by as much as I want to, so I was thinking about also registering for the Oct LSAT (I am applying to law school this cycle). However, I cannot request a refund for the Oct LSAT after I get my Sept LSAT score back if I score well on it and decide not to go through with the Oct test. Also, the deadline to register for Oct is the end of August, so I would not be able to wait to register until after my Sept score comes out. Has anyone else had to deal with this before, and if so, would LSAC offer at least a partial refund if I decide to cancel my registration for Oct?