Design Studio for a Printing Website

H there, I am looking for a design studio for my printing website. Something where clients can pick from templates and then add / change their details. The approved design should then be output to a press ready PDF. Will mainly be used for Business Cards, Stationery and other printed products. I would be interested in hearing from you if you have such a solution for sale or know of one that can be implemented. NOTE: I do not want to create this from scratch. Please send me examples / demo and costs. Thanks in advance.