From what I know about acoustics, you just need something that will absorb the sound. Rooms that have lots of soft things in them and have less open space usually are less echoey.
There are all kinds of things people do for soundproofing. There's, of course, soundproofing foam (which I imagine probably isn't that expensive [?]), egg cartons, drapes etc., anything with air pockets to absorb the sound.... On a simple search for soundproofing solutions, it looks like you can get small sound isolation shields for microphones, too for around $20-30. But since I've never had experience with recording, I don't know how ell any of these might work.
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