A great gift for the Joss Whedon fan on your list. $20 for these gently used DVDs in very good condition:
"Firefly" 4-disc DVD box set
"Serenity" (the Firefly movie) widescreen DVD
"Dr. Horrible's Sing-A-Long Blog" DVD (brand new sealed)
$20 for this lot, or buy as part of a larger Whedon collection including Buffy and Angel - see my other ads.