While not a specialist retailer, it provides consistent access to official products in a central, easy-to-visit location
Excellent cards typically sell for 85-95% of the Near Mint price
You could drop your opponents hand (lets say he/she took a prize last turn and has a decent-sized hand, likely to have what they needs for next turn) to only 4 cards by using N, but that leaves yourself with only 4 cards-worth of refresh
If you happen to get them both, The Library A Gift for Belle and Taffyta Muttonfudge Sour Speedster can work out
The Pokmon Card GRADED Box is fun to open and brings back that rush of nostalgia of opening old cards without having to pay a huge premium
MTG Vendors Moving on from retail pricing, there are plenty of well-known Magic vendors like Star City Games, CardKingdom, or TCGplayer willing to sell boxes for under $100