I have had Good Sam Roadside since 2011 and had to use them only once. Did not need to have a tire brought to me, used my spare and got swapped out the next day.
No idea what an emergency tire purchase might cost.
I dropped AAA because their rate in 2011 was about $170 for just the cars and they wanted a significant amount extra for the motor home coverage. Good Sam is still less expensive for the RV and car coverage.
Just my 2 cents.
2006 Sunseeker 3100SS/LTD
2008 Smart Passion Cabriolet TOAD
1986 Honda Helix (Original owner)