Obtaining ammonium perchlorate via double displacement reaction
The Wikipedia article for ammonium perchlorate gives a hint at how this can be done. The hint is that ammonium perchlorate is curiously less soluble than sodium perchlorate, and thus with the right concentrations, you would get ammonium perchlorate to precipitate by mixing solutions of sodium perchlorate and and, say, ammonium chloride.

$$\ce{NH4Cl(aq) + NaClO4(aq) -&gt; NH4ClO4(s) + NaCl(aq)}$$

That being said, the best advice that can be given on how to make ammonium perchlorate is 


  Don't. Especially do not use heat!


Ammonium perchlorate is fairly dangerous explosive that can decompose with not much provocation into a whole heck of a lot of gas for just a little bit of solid.

$$\ce{2NH4ClO4(s) -&gt; N2(g) + Cl2(g) + O2(g) + 4H2O(g)}$$

That this decomposition produces toxic chlorine gas should only make you want to prepare ammonium perchlorate less. 

Safely producing, storing, and transporting this compound is going to require a lot of specialized equipment and training (which is expensive). The danger here is not of the type that may lead to funny smells and dizziness in poorly ventilated rooms. The hazards associated with the compound involve loss of life or limb and serious structural damage if you look at it funny. Don't. For more information into the sort of destructive power ammonium perchlorate has, consider that this is the rocket fuel that got the space shuttle into low earth orbit. This stuff has the power to level industrial complexes with the forces of an earthquake.