Walgreens Cart Refill for Epson?

I've looked at a lot of stuff on the web concerning refilling inkjet
cartridges, but most of it is pretty old news, and not specific to
Epson.  I've got a new CX8400 that uses the Epson 69 series of
cartridges.

Will I have problems with getting these cartridges refilled at
Walgreens?  Would I save more if I just bought a refill kit?

Does this particular printer have some sort of chip in the cartridge
or some other mechanism that could cause problems?

I'm not using the printer for other than viewgraphs for work, so
absolutely accurate color isn't a big deal to me.

Or maybe someone else (Office Max? Depot?)  does a better job?

Is the savings worth it, and how many times can I refill the same
cartridge?

Thx!

Mark