ive been saving up my money for about a month and im up to 350 dollars whats the best i can get for that much
Standard things that will be asked are:

If you're willing to stretch price:
And If you're willing to go used:

I'd recomend something used, but if you could answer those questions first it would be helpful. And most people are going to say you should get a new amp 1st, depending on what you have.

And welcome to UG.
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