Yes Rockauto is GTG.
I think the least expensive way to go on an AFM disabler is to have a tuner turn it off. They take the ECM, update it and return it to you. There is a guy referenced many times here who does it mail order for $50.
The Range AFM disabler works well, the only downside is if you have to get emissions tested, you will have to remove it and drive around some to get your monitors set and all that time AFM is engaging and disengaging, after having been disabled for a significant period of time. Some of us think that is a very bad idea. I sold my range device because of those concerns. The next step up in cost is a Diablo Predator, will turn it off and do a few other handy things, but not very cost effective. The most expensive and probably worth it is a Black Bear Tune. With that, I think you get what you pay for, just like the guy turning it off with your ECU sent to him.
I think doing an AFM Delete if you had lifter issues anyway is probably a good choice. Although, a simple replacement of OE lifters and the updated VLOM, likely would give you an engine that would run trouble free for as long as anyone might own it, once the new stuff was installed. There are lots of threads on this subject.