For $89.95 labor, I'd suspect you're getting a transmissin flush instead of a drain and fill. If not, you should take your business elsewhere. (Check around before you do. For all I know, $180 is the going rate for an hour's labor in your area.)
As for the $8 in shop supplies, it's unfortunately a standard in the business. Rather than increasing labor rates or parts prices, shops began including shop supplies. It is what it is, and it won't change without legal intervention. Just be sure to compare apples to apples-- know what the shop supplies charge is up front prior to the work. Any reputable place should be willing to give you this information.
If your fluid smells and looks good, you shouldn't need any more than a drain and refill and replacement of the filter.