Darwin,
Since you're new here, you might want to take advantage of the Search button in the upper right area of the screen. Search for pot or cookpot and set the time frame for 3-6 months.
There are tons of threads on this topic.

You'll find that light and inexpensive have varying degrees, but will mostly be aluminum.
For that, you can go to Walmart, Target, or Kmart and look for a grease pot.
Kmart carries one that the lip rolls to the outside so you can use a special type pot lifter for it. Walmart has/had one that the lip rolls in and it is not as easy to use. You'll have to use something besides the pot lifter I mentioned. My local Walmart has one that has a handle (made by IMUSA I believe). Any of these would suffice.
You could also use a #3 peach can (or green been can) and attach a piece of wire to it.
Fairly light and very inexpensive.

Cheers,
Tango61