Trip,
we are happy to inform you that our wisemen have recently researched the secrets of the Alphabet and we would like to share them with our friends. As we consider this technology to be quiet valuable - we're the only known civilization which has the Alphabet and it is the first step to the Great Library - we think that 50 pieces of gold (or 3 gold/round) would be a fair price.
Please let me know if your civilization is interested to trade with us again.
Sincerly yours,
Picahulu, Ambassador of Neu Demogyptica