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You can expect most Asian games that have the local market as their main target audience, as opposed to an international audience, to be less prone to go on sale, even if they go on sale it's usually something like 20% off.

Pretty much any Steam edition of a game published by iWin that was not in some cheap bundle. The four Build-A-Lot games and Coconut Queen had one large sale, around six years ago, and after that, iWin apparently abandoned Steam altogether.

Just remembered Regency Solitaire.

Saw a bit (don´t remember exactly where) with the dev that has him explaining his earnings (he loves charts!) from games development throughout the years, and finding out that never doing sales helped him in the long run. Quite interesting actually, must´ve been on kotaku or gam....wait a second.

Boom!

edit: Enhanced Steam tells a different story :D

侠客风云传 (Tale of Wuxia) and 侠客风云传前传 (Tale of Wuxia Prequel).

I checked "Darkest of Days" and "Puzzle Quest 2" on steamdb.info and they both have already been on sale..

Steam tells me I bought Puzzle Quest 2 on Jul 12, 2013 @ 11:01am for US$2.49. (75% off)

http://store.steampowered.com/app/31300/Tunnel_Rats/ this thing

Don Bradman Cricket '14 and 17 have never been bundled or gone on a sale, though there was a permanent price drop for the former some time after its sequel was released.

The devs have commented in the forums that it's not economically sensible for them to put the games on sale, which seems curious.

Contradiction never goes on sale or it feels like it doesn't. I ended up paying full price.

Exanima is abandoned by devs :(

rimworld and factorio will have no any discounts, because of personal opinion of devs.
sorry about simple english :)

After Reset RPG - devs are scammers.

https://steam.madjoki.com/packages/nodiscounts
Thanks @madjoki

SiN Episodes: Emergence hasn't had a discount since 2013

Enchanted or Enhanced?