4/8 Limit Set = 4 x Chips per BB. 25BB Stack per player = 100 chips per player. 8 Handed = 800 $2 Chips.
8/16 Limit Set = 1600 $2 Chips
10/20 Limit Set = 800 $5 Chips
20/40 Limit Set = 1600 $5 Chips.
If you don't have any value stores ($40 for $2 and $100 for $5) you may need to increase the bank to 50BB per player or more.
I'd just sell by the rack.