Where to buy printer ink

I have avoided buying printer ink for about as long as I possibly can.... now my precious coupons will only sometimes scan at the store because they print out so light!

So where to buy printer ink?

I have been doing my research:

I started with Google Shopping- where I got prices starting at $9
Then I went to Ebay- prices starting at $2.50 for a refill kit, $7.50 for a refilled one.
Then I checked on Amazon- where they were $20.82 for a new one


In the end I went with the refilled HP ink cartridge for $7.49 with free shipping from ebay!