Ebay, sometimes craigslist. Buy older cans of name brands like NAPA, Cold Shot, etc. The new stuff from foreign countries can be contaminated.
You can either take the test online to get certified for refrigerants (it's like $10-$15) or provide them with a statement that you will sell the cans to a reseller.
You'll also need some oil.
You can either take the test online to get certified for refrigerants (it's like $10-$15) or provide them with a statement that you will sell the cans to a reseller.
You'll also need some oil.