I just bought one at Walmart over the weekend. I found it by the pharmacy. I had a little trouble using it since it was my first time. I had to hold the attachment inside me with my right hand so it wouldn't slip out and hold enema bag upside down with the left hand and squeeze the water out of it. Plus I had trouble keeping the kinks out of the tubing so the water could get through. It wasn't too bad once I got the hang of it, but it was a little frustrating at first. It was all worth it because I felt SO MUCH BETTER after that.
I used some of my bottled mountain spring arrowhead water for the enema, since I wasn't sure what was best to use. I filled the sink with hot water and dropped the bottles in there to warm them up for a few minutes. That way, they can't get too hot and won't be too cold either.