We have one that long that we found at either petco or petsmart. Our old apartment had a dining room with no doorway. Now that our apartment is smaller, we were able to split the gate and put it in two different doorways.
I'm pretty sure this is the one we have:
Wholesale Recordable CD/DVD Media CD-R/DVD-R BULK CDR/DVD+R MEDIA
Oh, and welcome to YT!!!