I do believe that a resale might be cheaper, however, I haven't seen many SSR resale contracts in that range. You would need to contact a couple of different brokers and get on waiting lists and tell them you want to do an addon at SSR in that point range. Then they will contact you when a contract comes up that meets your criteria.
Just to point out though, there's no telling how long you might have to wait, or if you'd get a different UY (if that matters to you), etc... Since SSR is still pretty new, I don't think there will be too many small SSR's that do come up in the near future (I could be wrong though).
If you want to add-on now, you might look at the bottom line and see how much you would really be saving. With smaller contracts, the overall impact isn't as big compared to 200 point contracts. A $3 difference would cost you $75-150 more, but could save quite a bit of time and ensure that you get the same UY... etc.
HTH