I bought it for 25€ the Deluxe Edition as birthday gift for my brother, not cheap if you ask me :(, it was several weeks ago, now already on sale.

Also in EU1, Germany, Fance, etc.... this game cost more than in EU2, the normal price of their game is 27€ and Deluxe 37€?.

I have still never played a Killing Floor game... :(

just bought killing floor (1) this weekend, so I will wait.

Depends why you want it. If you want to see your progress being restarted in few months - buy it.
If you want to report bugs and similar stuff - buy it.

If you want polished product with all features - wait. Right now there are 4 classes to play, today we got 4th map. Game is playable and it's rather good, but gets boring due to lack of choices.

Unless, that is, KF2 will go DayZ payment model, where Early Access version is much cheaper then full-release: then if you want KF2, but it when it's cheapest :P

I think this may be the best price for direct steam purchases for KF2 for a while. However, you can probably find a better deal with a GMG voucher or another retailer (not to mention those shady keysellers if you don't mind needing to shower) soon if you're patient.

Cheaper at Humble Bundle (at least in Europe).

https://www.humblebundle.com/store/p/killingfloor2_storefront

I'd buy it but I have to skip this sale, not biggie, just 3€ :p

My guess is
20/25% off in summer.
30/33% off in winter.

15% off isn't really a big deal. Did it even have a cheaper price when it launched?

Meh. Still seems over-priced for an Early Access game that doesn't have much going for it, apart from it's name.

I bought it full price, played 6 hours of it. Waiting for new features. No regrets

Oh, wow! 15% already?! This is a steal.

Wait it out. Tripwire are known to nickel and dime their community with DLCs.

GOTY or fuck off.