The LSAC has a free practice LSAT on its website at http://lsac.org/LSAT/lsat-prep-materials.asp
. Take it to get an idea of where your score might be if you took the test for real.
Or, you can see if Kaplan is offering a proctored practice test in your area. The Kaplan practice test is free, but it's designed to give Kaplan a group of people to whom they can market their test prep courses. At the end of the practice test, they'll offer you a discounted rate on the test prep classes. Don't feel pressured to sign up -- they'll e-mail you more coupons later.
After you have an idea of what your LSAT score might be, go to the UGPA/LSAT search screen of the Official Guide to ABA-Approved Law Schools at http://officialguide.lsac.org/
and plug in your numbers.