The Series 5 monsters (#121-144) were available at least in single packs and
in 6- and 12-pack display cases. The two different 12-packs included all 24 Series 5
monsters.
Images extracted from list scanned by
Scott Andrew Hutchins.
Here are pictures of some packs:
See also Scott Andrew Hutchins's
Figures Packaging Guide.
Figures:
121.
Tarantula 
122.
Black Widow Spider 
123.
Jumping Spider 
124.
Wolf Spider 
125.
Turret Spider 
126.
Crab Spider 
127.
Soldier Beetle 
128.
Soldier Fly 
129.
Robber Fly 
130.
Armoured Cockroach 
131.
Vampire Leaf Hopper 
132.
Lightning Bug 
133.
Eastern Toe Biter 
134.
Stink Bug 
135.
One Eyed Jack 
136.
Clubtail Dragonfly 
137.
Dog Face Butterfly 
138.
Horntail Moth 
139.
Scarface Scorpion 
140.
Mexican Bed Bug 
141.
Lady Bug 
142.
Horsefly 
143.
Cave Cricket 
144.
Hunchback Beetle 