I've got two 275/35R18 RE-71Rs with 4/32" / 3 mm of tread remaining that I don't need anymore. The outside shoulders are worn, but the tires are worn quite evenly and have never been flipped, so they should work quite well and last a decent while if you flip them.
Here's a picture of the good shoulders.
They're yours for free, *but* only if you pick them up from my place in West Hillhurst, and get them *and the other two tires in the set* dismounted, and bring the wheels back to me afterward.
The two other tires in the set are starting to delaminate on the shoulders, so I wouldn't recommend using them. Having said that, if you flip them, you could probably get a few events out of them.
If you're interested, text me at for-oh-three nine-one-nine thre-one-for-eight (misspellings intentional to confuse phone-number-scraping bots) or email me at my name (in my signature) @live.com, with no space between my first and last names.
Thanks!