Blank Photo Card Supplier
Yes, for a number of years until getting too overwhelmed more recently.
If doing gloss, I suggest checking out Red River Paper http://www.redrivercatalog.com/ they have a nice selection of papers and card format. They also have art papers for B&W and a matte finish. Another art paper worth considering is Moab Entrada. Relatively inexpensive and prints up nice (but not for water soluble inks). http://moabpaper.com/entradalopes/
I used to use Red River Paper until the paper I liked went end of life. It was an N finish that worked very well with water soluble inks. After than I got an Epson 2200 and switched to Moab Entrada, which is a nice art paper that works well with archival inks.