Crazy Taxi is currently free on the App Store. It’s unclear whether it’s a new version that will remain permanently free or temporarily on sale, but it is noted that there’s no in-app purchases.
I’ve just spent a solid 20 minutes or so playing the game and it definitely brought back memories of playing the game some years ago.
I’d definitely start the download now just incase it does jump back up to $8. You can find it HERE.