Let's try some sets:
'68: 1A, 1B, 2B, 3A, 3B, 4A $15
Alabaster Wolves #1-5 $8
Aleister Arcane #1-3 $10 SOLD
Aliens #1-6 (1st prints) $12 SOLD
Amazing Spider-Man #334-349 (Sinister Six) $3 SOLD
Annihilation Ronan #1-4 (Dell Otto covers) $7.50
Avengers #0, 19-22 (Ultron Unleashed arc) $5 (3 2 available)
Age of Ultron #1-12 $6
Batman #417-420 (Ten Nights of the Beast) VF/NM $8.50
Batman Confidential #17-21 (Bat & the Cat) $6
Born #1-4 $7.50 (3 available)
Breath of Bones #1-3 $6 (2 available)
The Crow #1-3 FREE w/claim and purchase of another set SOLD
Edge of Venomverse #1A NM $3 (2 available)
Generations Thor 2nd Print NM $2.50
Ultimate Comics Spider-Man #1 NM $2.50 SOLD
Green Lantern #20 NM $3 SOLD
Spider-Man #1 Silver NM $5 (2 available) SOLD
New Avengers #11 VF/NM $2.50 (copy B) SOLD
New Avengers #27 VF/NM $2.50