Cat's Pyjamas can provide you with promotional materials to use on social media and in Facebook and Book Bub adverts. They can also provide social media and website banners, author logos, and boxed sets.
Logos: These start at $30
Banners: using your book design $40 for FaceBook and +$10 to include Twitter
Promo posts: $30 for set of 3 posts- chose either FB/Twitter/Pinterest/Instagram - you may have 1 design sized for 3 social media or 3 designs for 1 social media.