I am going to continue to look for a used PHD but I am also going to stop on the way home tonight and look at a new Howse PHD. I already know the price of the howse unit which is roughly close to most of my options thus far. I just don't like buying something for such a limited use. Manual PHD are just about useless in this case and the 1 and 2 man PHD was major effort for limited results. I was putting all of my weight on a 1 man while someone else held it and it just did not go down. Only other option is bore hole and dynamite.
By the time I rent a hoe, get it to my place and do what needs doing I have spent just as much as buying the Howse PHD. The local RSC wants to charge me for 2 days rental if I get anything during a weekend. That makes a 1 day rental of a 2 man PHD $200.:confused2: They do have a skid steer with a PHD but it would cost more then buying the Howse.
I like your dynamite solution. Dynamite was the only answer in KS. where I grew up. Rocks! Rocks and more Rocks! Known as the Flint Hills for a reason. Punch a hole with a bar, add maybe 1/8 stick of dynamite and you were done except for finding enough dirt/rocks for backfill. Total time 5 minutes if you used a long fuse. We could buy dynamite, caps, and fuse at any hardware store or lumber yard. It was dirt cheap. I was able to buy it before I turned 18 provided I would give the name of a responsible adult that I was working for. The availability of dynamite went away sometime after I left the farm in 1960. The mention of dynamite today will probably draw a visit from several government agencies. Everybody now uses rock augers with down pressure to punch post holes. It now takes a $3500 auger to do what 10 cent worth of dynamite used to accomplish. It was great fun too. Always like to use the leftover dynamite to shoot out big trees.