I purchased a couple police surplus PPs several years ago when they were fairly common on the used market here in the US. As noted above, those surplus PPs tend to be in very good to excellent condition. $400 was the going rate at the time, but $550-600 is an average range for a Manurhin made PP in excellent condition and they are not going to get less expensive.
Also as noted above, Walther started "making" PPs again once the post war small arms restrictions were lifted. But this is a bit of a misnomer. After WWII, Walther moved the tooling to the Alsace region of France (where the population was ethnically German) and Manuhrin made the pistols from walther forgings.
In 1958 Walther started having finished frames and small parts shipped from Manuhrin along with machined but unfinished, un-heat treated and un-rollmarked slides. Walther then induction heat treated, roll marked and finished the slides and performed the final inspection. Under West German law, those actions qualified the pistol as being made in West Germany. Since the slides were finished separately from the frames, its not uncommon to see a slight mismatch in the bluing between the two. The Walther pistols have snob appeal, but the quality of the Manuhrin pistols is just as good.
In 1986 Walther finally started making entire pistols in West Germany, but in the opinion of many PP owners, the quality of those pistols actually dropped a bit.
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FEG also made near clones of the PP series pistols, but since they were originally designed for use in 9mm Makarov, the frames and slides are slightly heavier.
I like the FEG steel frame AP pistols as much as I like the Walther PP pistols. The AP9S is a PP sized .380 ACP (9mm Kurz) pistol while the APK9S is a PPK/S sized .380 ACP pistol. AP7S and APKS are the same except in .32 ACP (7.65 Browning).
Quality of finish depends on who imported them. Interarms started importing them when supplies of PP and PPK/S pistols were in doubt and they ordered them to a very high standard of finish. Several years ago you could find them in near mint condition for $350-$400. Now that will get you one in fair to good condition.
TGI also imported them and the finish on them isn't as high, but they are just as reliable.
In general the FEG pistols have slightly larger chamber dimensions than the Walther pistols and are usually not very picky about ammunition.
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The slightly heavier weight and more generous grip dimensions of the FEG pistols make them more pleasant to shoot in .380 ACP than the Walther PP. The Walther PP is however a very sweet pistol to shoot in .32 ACP.
For self defense purposes there isn't much difference between the .32 ACP and the .380 ACP when shooting FMJs. The .380 ACP might be marginally more effective, but you get an extra round in the magazine with .32 ACP. Hornady XTP hollow points both perform well in PP length barrels, where velocity is around 1050-1100 fps.
Below (top) is an Interarms AP9S, with an AP7S below it and a pair of police surplus PPs in 7.65mm Browning on the bottom: