You may just have to pay for tethering and move on down the road so to speak! You can afford 100 per month for a phone, but not another 30 to tether? If you are a vet, Verizon gives a 15 percent discount if you take in a copy of your DD214. I get a 20 percent discount from the bank I retired from. When I was on unlimited and had tethering, they gave me the discount of the tethering also.
Because you can no longer stay on unlimited and add Canada roaming last summer, I ended up going on a share everything plan, as we boat in Canada each summer.
They are trying very hard to get everyone off unlimited, with road blocks at each turn!
Chris