Need custom business folders

I'm having a hard time even finding a sub that fits my question, so I hope this fits close enough. Our small company has die-cut business cards, and we need presentation folders with slits that actually hold them in place. Since they're not regular sized business cards, I can't just order regular folders that assume your business card is 3.5 x 2. Do any of you wonderfully talented people have experience with this or have a suggestion for a company that can deliver budget folders with simple special requests like this?