Most all the race fuel companies sell E-85 & E-98. But, their prices are way above pump E-85 prices. Cost would be well above what most would pay. I assume that you could mix in small amounts of the E-98, to raise the percentage, when pump E-85 measures only 70%.

https://www.sunocoracefuels.com/fuel/e85-r

https://vpracingfuels.com/product/c85/

https://www.renegaderacefuel.com/fuels-2/ethanol-race-fuels/

http://e98racing.com/web/

https://www.maperformance.com/products/55-gallon-drum-of-e98-ethanol-racing-fuel

http://www.igniteracingfuel.com/E-98.html

https://skspeed.com/vp-racing-fuel-x98-115-octane-pure-e98-more-consistent-than-pump-5-gallon-pail/

Torco calls theirs T85 & T98.

http://torcoracefuel.net/pro-fuels.html