Well then, why don't we start the list here?
Material: Packing tape
Cost: $9.28/6-pack [staples.com] (or "free" some from slavery at work)
Availability: fairly ubiquitous unless you live in a cave
Pros: CHEAP, quick to apply, CHEAP, easy to remove, CHEAP, great for testing, CHEAP
Cons: not the most durable or pretty
Material: Cardboard
Cost: FREE if you've ever seen a cardboard box. ever.
Availability: fairly ubiquitous unless you live in a cave
Pros: CHEAP, quick to form, CHEAP, easy to find, CHEAP, great for testing, CHEAP, works great in conjunction with Packing tape
Cons: not the most durable or pretty
