I just checked back in with my local contact at Stapp Interstate Toyota (just north of Denver by about 30 miles). He said earlier this year that he'd match the best quote I got for the 8 year/75k mile Platinum VSP, which was $734.
This also seems a good time to repost the table that I compiled earlier:
Reposting the chart and updating my own info:
Today I bought an 8 year/75k miles/$0 deductible Toyota Platinum VSP from Bruce Harrington at Stapp Interstate Toyota in Frederick, CO. $734. No tax even though CO is a sales tax state. Smooth transaction, with only a slight delay as the Toyota internal site where he verified my vehicle's in-service/purchase date was laggy.
I shall therefore be covered until February 20, 2021! (We don't drive long distances so won't run up against that 75k limit by that time: we've put about 6k miles on in the past 10 months, for reference.)