Letter e replacements are available as part of a letter subscription package. The basic package has z, q, j, x, and k for only costs £25 per month. If you want to include e, you'll have to upgrade to the deluxe premium pack which has every letter, for only £79 per month.*
*Punctuation not included. English alphabet only, terms and conditions apply. May not be used for commercial, blasphemous, or heretical purposes.