CafePress, Inc., an e-commerce site where customers create, buy and sell personalized products, filed on Friday with the SEC to raise up to $80 million in an initial public offering. The San Mateo, CA-based company was founded in 1999 and booked $138 million in sales for the 12 months ended March 31, 2011. J.P. Morgan, Jefferies & Co., and Cowen & Company are the lead underwriters on the deal. No pricing terms were disclosed.