1) Which version iPhone? If 4S, then you will have to wait a little while, as the A5 JB is not ready yet. 3GS and 4 models have a untethered JB which works fine with 5.0.1.
2) Untethering, if detected and not part of your contract/agreement, may get you in trouble with your provider.
3) Never every pay for software like Redsnow. It is provided free. If you have paid for it, you have been ripped off.
Edit: After reading your previous post have a look here:
http://www.iclarified.com/entry/index.php?enid=18989
I would recommend PDANet from Cydia store for stealth untethering.