Amanda D.
Yelp
Turning Point is one of the best music stores if you're looking for a wide selection. They have two floors of 20,000 titles, including 10,000 LPs on their second floor. They offer music from every genre and strive to sell hard to find music rather than mainstream CDs you could find anywhere in the city. Prices of LPs are generally $4-$6 and CDs range from $4-$11.
If you're looking to sell, they claim to be one of the highest buyers of used CDs, records and movies.
Turning Point also has a huge selection of DVDs and some VHS all categorized by genre. Their prices are reasonable with DVDs costing about $10 and VHS costing $2. You can sometimes find a rare film here, but their selection is mainly what you'd find in HMV.