I am sorry that I cannot provide any information of a suitable product in a very inexpensive price range.
If you have the budget, the Puritan PSM156 works very well, and is one of the cheaper solutions that deliver at it’s level of performance (that I have encountered). Go online and look at internal photos, you will see individual isolation between each outlet, compare that to others, though it may not promise to be the best, it sure shows the engineering intent.
Maybe someone can direct you to a free trial, I think the importer offered a money back period - mine sure didn’t go back.
As you’ve not discussed your system, and yeah I understand where you’re coming from, but my digital has much lower noise floor.
Generally, I would never suggest an over the budget solution, however if you were to stretch it - this is one buy that might be worthy of such a lack of discipline.
