Never wanting to waste more material than necessary I have recently added cutting larger size letters and numbers out of elevation drop outs. We now have a nice assortment of 3/4" and 1" high letters in 1/16" and 1/8" acrylic plastic, all with adhesive transfer tape on the back. Most are clear and some of the ones that are 1/16" thick may be white. They are in the same fonts as our regular letter sets that range in six from 3/16" up to 1" high, are laser cut out of PolyBak and also have adhesive transfer tape on the back.
The 3/4" letters & numbers are 6 for $1.00 and the 1" high letters are 5 for $1.00, you pick the letters, plus 1st class USPS.