Tractor supply has chains for between 40 and 80 bucks too in common sizes. The weights are pretty easy to take on and off, but i leave min eon year round cause even mowing on a little hill when turning i spin the tires sometimes. They are worth their weight in gold when you NEED them! 8" allthread style carriage bolts will work perfectly- use nuts and lock washers but don't overtighten the nuts.Thanks GT_80! Yup, these are the plastic beauties.
I see that lowes has carriage bolts with all thread, instead of just the ends. I guess I'll get the 1/2" - 13 x 8" items from them with all thread, so that I can cut if needed. I also saw in the archives, that I could also put a 2nd nut on the other side of the wheel, so that it makes putting them on easier.
Given the effort, I think I'll leave them on year round.
PS, for anyone else going through this process, I found that tirechains.com seems to have a very wide selection (sizes) of 2 link chains under the garden tractor section at pretty good (relatively!) prices.