I have 5 well working TPHs, between my sons and I, and they are wonderful. All of them have had a few, or several trips to the smith and back. They are the best, the smallest, the flattest, the most accurate, and in all ways the best. I have had all the others as well. My second favorite is the Iver Johnson TP-22 which is no longer made and fairly reliable.
I now prefer the KelTec P-32 as it is the same size, thickness and weight. But I will not sell my TPHs, just in case.
There is one of the TPHS in the local gun shop for about $500 and it has been back to the smith as it was one of my son's pistols, which he traded for something else. It works fine and is VERY accurate and reliable with Quik-Shoks. TPHS need maximum .22 ammo to work well. They do NOT like standard velocity ammo. I've found the Quik-Shoks to work FAR better in accuracy and reliability in the TPH, than Stingers or any other HV ammo.
You can sometimes find a TPH for as little as $350 but not often. I've only seen one below $450 in the last year. When S&W bought out Interarms they dumped out blemished TPHs for $330 and I got 4 of them. I've since sold two for $450 and $500 to retired international law enforcement officers, who are about the only ones who really appreciate the little TPHs. The last I knew, neither of them would ever be willing to sell the little babies.
There is a local smith here who has done a good job on two of my TPHs. It is very hard to find anyone who will work on them at all, or who can find any parts for them.