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I mean it takes that much of your time to GET it.

That's a cheap-a** supressor if you're only spending $300.

Price of suppressor + $200 for the tax stamp, and then wait for the average tur-around fo six months, and VOILA! You can take possession of your shiny new suppressor.

Your average citizen isn't going to get a Class 3 SOT (since it isn't required, and requires them to keep a bound book, which can be inspected on a whim, as can their inventory), he's gonna pay the $200 tax stamp instead of all the extra s**t it takes to get a class 3 SOT FFL, which DOES require an actual storefront.

And the price goes out a bit more like this:

Threaded barrel, if it doesn't already have it
+
Suppressor Price
+
Tax stamp
+
Sales Tax
=
Total price.

Simplified, it's suppressor plus tax stamp, but that's the full equation. It really sucks here in TN, with a sales tax of 9.7. We don't ahve an actual state income tax, though.