Update 4/3/11: Walgreens has improved their ink refill service and it is worth it! At $12.99 for a black or color ink cartridge refill, you can’t lose if you use Walgreen’s service.  100% Quality Guarantee!
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Great News!  No coupons necessary! 
Walgreens will refill your black ink cartridge for ($10) $12.99 and your color cartridge for ($15 ) $12.99. I was leery of this, but the manager assured me that they test the cartridges a few times. If a cartridge doesn’t pass the test, they return it to you – filled – and at no …