I live in New Zealand so I am pushed for tanks. I would like to keep budget to a minimum. I have considered buying a 20l kit that includes a hood light and filter.tunafax said:Petco dollar per gallon sale will sell you a 10g tank for 10 dollars. That's cheaper than a 5 gallon.
You can get one of those 3+ gallon plastic kits, they already come with a filter that's decent for bettas and also a light. They're actually really neat tanks.
Craigslist also exists.
What is your budget?