I always include Taurine whenever I use Clenbuterol. I use to get some awful calf and leg cramps when I was on Clen. i was drinking like 6liters of water a day at the time too! Then I added 3-5 grams of Taurine in there and the cramping stopped.
You can get Taurine in capsules or powder form. I myself prefer the powder form but sometimes the capsules can be more convenient.
And yes, it's so inexpensive.

http://www.kilosports.com

$19.95 a kilo

Seems to be pretty good for BP.

Yeah, not bad for a hard-on either. hehe

I picked this up from another board, but 15-20 grams before bed = lights out. I'm about to do a face plant into my keyboard. And you sleep like a stone, too.