Thanks Shannon for
pointing out the above T-post puller which can be found for a bit
under a hundred dollars.
The design is clever, but I
don't think it would work with our lower grade fence posts.
These lighter posts are more
like a U shape. They fit in well with our applications at less than
half the price of the sturdier T-post.
...one uses the bumper jack method. A bumper jack can be had for 5-10 bucks at many junk yards. Although they are getting harder to find. Jack and a strap will work as well as most T-post pullers, and will work as well on the cheaper posts you've got (which I've used in the past) as long as you can keep the strap from slipping on the post.
I've always been cheap and just used the wiggle-wiggle-pull method here, but we don't have rocks in our soil. I wouldn't want to fight too many posts out of the ground by hand where you are.