Recommended games around $7 ?

People say the next steam sale is tomorrow, might want to wait a day or two. :)

Yes it's possible for haloween sale tomorrow, but only on specific thematic games.

If you like platformers, those are pretty cheap, but really awesome:

140
Gunman Clive
Gunman Clive 2
Refunct (first person view, but basically a platformer)

Some of the coolest indie games of the last years:

One Finger Death Punch
Super Hexagon

EDIT: and yes, people are right. you should wait for the sale. ^^

It really depends what you are into.
Search for the best user reviews, that is your best shot probably.
And if you can wait a day, do it when the sale starts :)
You could get a couple of good games on sale, but read the reviews if you want to be thrifty with your $8!

That depends a lot on what you actually like. If you want a game with a lot of replay value, then something like Dungeons of Dredmor might be worth checking out (it often goes on good sales, and has a base-price of 5€). Similar to DoD, but more complex (and I would say better, but that's subjective) is Tales of Maj'eyal, which costs 7€ (I've spent just shy of 40h with this one!).

But if money is a concern, wait for sales.

Thank you all guys, I decided to wait until Halloween sale (today) haha, and this is what I bought for only $8:

I had $8 in my steam wallet and this is what I bought:

Polarity
How to Survive - Storm Warning Edition
Ghost Master
The Witcher 2: Assassins of Kings Enhanced Edition
Lilly and Sasha: Curse of the Immortals ( 2 copies)
Deadlight

I think it was a great deal, nice halloween sale for me. Also thank you so much for your suggestions, I'm gonna make a GA of one of those games just for you guys :)