I'm surprised at
frankmp's posting above since I paid about $184 + environmental fee + gst, for each of the 2 DCT filters I bought for my 2020 C8 from the same KippScottBuyGMParts.ca but that was some time ago: before I even took delivery. Is it the correct filter? I'm told there are 2 filters on the DCT: the drop-down one that needs to be replaced at 12,000 km and an "in-line" filter.
More recently and with 12,000 km on my C8, I called the 3 dealers in Edmonton who sell more Corvettes and the prices they quoted for the DCT filter change (NOT changing out all the fluid or adding the 2 litres for track use) were around $850, $750 and $650 all in...that included a DCT filter for just about $293...and the highest one quoted me 2.4 hours labour which is supposedly specified in the GM guide, whatever that is. Being "an old dog" I asked if the 2.4 hours were specified in the Chilton guide but was told no; the GM guide.
There are YouTube videos showing how to change it; it's not hard to do for the DIY crowd. I'd planned to but I'm too *!#!*%$# busy at work these days.
So my advice is to call around; you may find a lower price elsewhere. You should also confirm they'll replace the fluid lost when dropping the DCT filter. The manual suggests it be replaced and with a few people having transmission problems, it's likely best to do so even though it's not a lot of fluid when looking at the YouTube videos...although there could be fluid retained in the filter itself. Hope this helps.