I wouldn't waste my $$$ on any chip like the Jet. Essentially, a chip like that primarily gains its small amount of performance by primarily advancing the engine timing which then requires you run 89 or even 91 octane gas. They also only make that small amount of difference at very high rpms and then only when the engine is also at wide open throttle. Unless you drag race your Jeep at the quarter-mile strip, they're a waste of $$$. In normal driving, you won't notice any difference.
The Edge product provides more benefit than a chip does but even it won't make a dramatic improvement. It advances the timing but it also makes the engine run richer by "fooling" the computer by thinking the engine is running cooler than it really is so it stays in the warm-up loop which can really pretty much destroy your fuel economy.
Forget installing a throttle body spacer. Spacers can help significantly when placed under a carburetor or throttle body injection system but the TJ's throttle body is not a TBI type system so a spacer won't help in the least. Only air passes through the TJ's type of throttle body so adding a spacer would be useless and provide zero benefit. Forget too their claims of "swirling" the air since even if it did, any swirling effect would be lost entirely by the time it got down the intake manifold and past the intake valves into the combustion chambers, all well below and far enough away that it has zero effect. Save your $$$. Besides, a Jeep Wrangler TJ is meant for offroading, not street racing with the local ricers.