baseball card sleeves trick for couponing

I know alot of people have better ways to do this. But, for those of us that are low on money and cant buy lots of baseball card holders or something better then what im about to suggest to make the 9 slot baseball sleeves go further.  I knew my daughter had construction paper hanging around so i made a template of the size i needed for the baseball sleeves and cut em out. One sheet of construction paper depending on if you can get more then the 9 per sheet i couldnt but you maybe able too. Then put them into the slots and poof instead of 9 per page for coupons you have 18.....without forking over more money for the double sided sleeves...If you have any other tips for anyone in this area please feel free to comment..any suggestions are welcome.