Blackstone does offer a volume discount - either you buy ten prepaid tests or you get some of your gearhead friends to chip in and buy a grouping. I've down to I think my last one out of ten and when I bought them it was $220 for the ten but that has now been 4-5 years as I just don't drive that much anymore. If you have any connection to a formal racing venue, even sanctioned autocross, they also offer a discount for that since we would send them in every oil change which ended up being about every 500 miles on a track and often 2-3 times in a season.
I sent mine in on the Sorento a little later in its life, learned not to send them in on a new engine because just too many things happening with break in. Results are actually better than the averages but I'm changing at 5,000 miles. If you also get the TBN readings, they can give you an idea of how far to extend the OCI although on our cars still under warranty, it doesn't matter what they say, only what Kia requires. But I've done that at times in the past and they always recommend going further than 5,000 with synthetic and OEM filter - suggest 7,500 and retest.