Whoever sells recording tape in your area, is going to sell that. If there is an analog studio in your vicinity, they could tell you where they get theirs, or possibly sell you those items.
Or you could look in the yellow pages of the nearest big(ger)city. Many times, tape and CD duping places will sell tape, and the reels as well. You could buy it over the phone, and have it sent to you.
Mixerman