8mm : Sony vs Exatape on Exabyte drive. Best price?

[Michael E. Hummell]

We get fewest "retries" (in fact, none, with the one "free sample" that
came with the machine) when we use  "Exatape 8mm Data Cartridge" from
Exabyte Corporation.  But they cost $40 each from Exabyte, or $35.90 in
quantities over 50, according to Cheryl Boyer of Exabyte, 1-800-767-8273 .
[FYI:  Exabyte Corp. 1745 38th St. , Boulder, CO 80301-2603 (303)442-4333
]

The other tapes tried were:
1. Sony 8mm data cartridge QG-112M             ($33 from INMAC Corp.)
2. Sony Metal HG VIdeo 8 NTSC 120              (about $7 , "on sale")
3. Sony P6-120MP "regular" Video-8             (about $6 , "on sale")

The less we paid, the more "retries" we get when doing backups with
"dump".  Our question:  Where's the cheapest place to order "Exatape 8mm"
from ?