Lead tape is lead tape really. One thing that may be important to you is getting tape that isn't too wide. Most lead tape is designed for tennis rackets, and so, is far too wide for a badminton racket. It's not a great problem but it means you have to cut the lead tape and depending on how well you do this, you could compromise the aerodynamics of your racket even more than with well cut tape or tape that fitted in the first place. Other than that, just look for the cheapest tape you can find. You can get lead tape at your local tennis shop.
Do you know which shop and is it for badminton rackets or tennis racket? Current i'm using Karkaral M-Tec 70 ISO which is a bit too light and can't generate much power. i'm hoping that by putting on leadtape will add a bit weight on the head as well as to protect the racket from scratches.
yes, you can get it from Gala at Queensway....man, i pasted 0.5 gram worth of the tape at 11o'clock and 1 o'clock on my gosen 6900 racket, makes a lot of difference.