I can confirm that Best Buy will price match Costco for $999 plus you get 18 month financing because I recently purchased the 128gb model. I was in the market for the 256 but nearly a 25% discount (and under a grand) was too good to pass up. Costco will offer a similar discount that comes out to 20% off for the 256gb model later this week, bringing it down to $1199.
I use iCloud anyways and currently only used 90gb of my 256gb hard drive (which shows 250gb total capacity), so I assume 90 of 128gb won't be so bad (which will likely show around 120gb total capacity). Also, of this 90gb, half is taken up by iCloud storage which probably also I'm assuming includes files I downloaded from the cloud.
I should mention that I'm the type of person who changes my laptop nearly every year, so I'll be looking to get the new thinner bezel 13" MBP whenever it releases later next year and will sell this one off at that point.
The ad link for the 256gb version is here but you will have to wait till Thursday: https://bestblackfriday.com/ads/costco-black-friday/page-8#ad_view
Where do you typically sell off your old model? I was thinking of doing the same thing because I want a 13" Pro but I don't want to wait to Q2 2020 to buy one. Was thinking of selling the 2019 model at the time and upgrading.