Emma Best, a new customer who works in the design industry, used Solopress to order her wedding 'thank you' cards and only learned of her prize after her honeymoon.
Solopress presented Best with a gold iPad Mini "to say thank you and celebrate the occasion".
Solopress co-founder Aron Priest, who set the company up with business partner Andy Smith in 1999, said: "We wanted to commemorate this milestone in our company's history, as well as let Emma know how much we appreciate her business.
"A gold iPad seemed fitting as we approach the holiday season, and it follows our tradition of holding customer giveaways that often feature the latest gadgets as prizes."
Solopress is based in Southend and employs 174 staff.