I have 4 free-standing Acoustic Panels from my recording studio. They are $75 each.
Four can be arranged to be a perfect vocal booth, or positioned wherever there are hard surfaces to buttress.
They can be disassembled for storage or transport.
Dimensions: H 86" x W 27". The base on the floor is 34" W.
CALL 3 three 6 / seven O six / two 6 siks oh.