I know by reading yer post that price is an overwhelming part of your choices. You should consider a couple of things before choosing.
1. Style of drumming
2.Quality of the kik and the heads on it.
3.What you'll be amplifying this signal into.
A good quality kik sound comes from these factors as well as room, and the skills of the recordist.
A good kik mic will have a very fast rise time on the lower freqencies and wont have any artificial bumps in the mids with a slight rise in the highs. And it will handle large spl numbers well.
This alone obsoletes a LOT of the cheaper mics that are so-called 'kik' drum mics. There are choices.
This may start a war but if you spend your money on getting the drum right, then a plain ole SM57 will work well in most cases. Its not going to be ideal, but its not going to hurt the sound if its a quality sound to begin with.
Unless you're playing manical black death metal trash and fear rock.....then all bets are off.
I love the ATM 25. It'll work in every situation whereas a D112 is a mic that is not as versatile. It is automatic however. You stick it and forget it. Same for the Audix D6. Before anyone wants to argue, I own and use all three.
Another route to consider is
the Audix D4. Can be found used around $100 and makes a great little kik mic. You want to mount it off center of the pedal...I use one for the 'click' exclusively and an ATM25 at the front head with a secret LDC out front for the boom. Works for me.