X is so fun. if you are getting a double stack then 20 bucks is about right on. ask your dealer about quantity though. my main dealer gives us 5 for $50 but we are semi regulars and we normally buy 10. my favorite way to do it is to crush it up and do half of it in a line and parachute the other half of it.(put it in a toilet paper square and fold it up then swallow it).
then when my roll starts to peak i just pop the other pill and it lasts so much longer/is so much better