...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.

Assuming these u-shaped posts have regularly spaced holes, all you need to pull them is a sturdy piece of wood, e.g. a 2x4, with a nail just big enough to fit the holes in the post driven through one end and a fulcrum to rest it on...

If not a 2x4 then something like the puller for the "T" post but with a pin to fit in the holes instead of the articulated end as that puller has.

Mark says that Roland's idea is ingenious! Shannon, we do pretty well with the wiggle method, but it can get tough in some of our heavy clay.

Just noticed you'd commented while I was commenting...