Is it possible?

We have a 10% coupon but want to only offer it to people that spend £100 or less...

(as most people get 10% for buying 3 of our popular items .. so they end up getting 10% twice)

We are using table_discounts and better_together from thatsoftwareguy.

I can see that we have a spend X or more - but not less - can we do anything??

Thanks
Sarah