You'll have to explain exactly what you mean by "Deleveling the economy" and what you're looking for a mod to do.
However, if you're looking for a mod which alters the inventories of shops and prevents their inventory increasing in level and value as your character increases in level, that should be something that you could simply make yourself with the Skyrim Creation Kit.
It shouldn't really be too difficult to modify the inventories of all of the vendors, or modify the items themselves and change whether they can appear in shop inventories, or can only be found as loot in the world.
That's what I do anyway, if I can't find a mod that does what I want, I either just harness the power of CHIM and use the console to give myself custom enchanted items with the desired enchantments from the extensive base of items and effects already contained in the game (such as an amulet with a few Fortify Shouts enchantments that reduce the cooldown on shouts to 0, or a pair of spiked gauntlets with Fortify Unarmed 100 x 2 which makes unarmed combat viable), or I make a simple mod to create the desired item or spell (such a more useful lightning stream spell that does more damage and sets things on fire).
