How much does it cost to send a letter / postcard?

It costs 1 credit to send a letter or postcard within Spectre.

The actual cost of the letter or postcard depends on which Print Credit Package you have purchased. 

Please see below for clarity:

If you purchased the Large package, 1 credit would be worth 46p, whereas if you purchased the Extra Small package, 1 credit would be worth 61p.