What Affordable Brace Would You Recommend For Sciatica Pain, And Are The Hip-leg Braces From Walmart Effective?

I m looking for a brace to wear to help sciatica pain,what do you recommend,that is affordable, preferably under $30. I see braces from Walmart that wrap around the hip plus leg for $20, is that a waste of $. Not sure what to wear, doctor already gave me medication and my pain got worst and the medication stopped working, in constant pain now since I went on the meds.