The ad copy does NOT indicate that you will get the stovepipes with the e-bay kit. And at a price of $72 (including shipping), I would not expect them.
It is especially important with a 95-98 model that you use a reduced diameter stovepipe. Those older models put the hot, stock 3/4" stovepipe right up against the plastic. We know that the best way to repair these is to provide a heat shield in the EGR passage as APN does. And we know that the UIM will be slower to fail if there is an air gap between the hot pipe and the EGR bore. That air gap is provided by the stovepipes supplied in both the Dorman and the APN kits.
The Dorman kit is better than the e-bay kit because you will end up with an air gap around the stovepipe that protects the plastic. But the Dorman kit does NOT provide a metal heat shield, and the Dorman kit costs a LOT more. Usually Dormans sell for $150 or more locally.
If you choose the kit from e-bay, you will be getting a fix that is little better than what GM supplied new. But you will save $43 compared to the best fix you could do- the APN kit, which costs $115 including shipping. To me, it makes little sense to pay more for a Dorman kit to get less than the best repair.
So, the bottom line is: yes, you can save $43 by choosing the worst possible repair for the UIM. You will be putting the engine back in the condition it was sold by GM, with an inherent flaw that you could have rectified. When you sell the car, you can get more than your $43 back by explaining to the purchaser how you corrected that inherent flaw.
Compare the savings based on the total cost of the work you will be doing. The best fix will cost about $500 total vs $457. You will save 9% by choosing the worst instead of the best fix.
You will wait for shipping for a few days for the APN kit. Who knows how long it will take the e-bay kit to ship? If you are in a hurry, forget about saving money - you will pay more for a local off-the-shelf Dorman kit, and will still not get as good a repair as the APN.