Automatic Litterbox Central

Generally, Smarthome has close to the cheapest price for a six-pack of Scoopfree Cartridges
but now, Couponhut.com reports that Smart home has a current coupon for:
Save 20% off ANY purchase.
SmartHome coupon code: ERET05,
Expires: 07/31/06

The standard price for a six pack is; $88.99

See:
http://www.smarthome.com/616526.HTML

20% off is a savings of $17.80 on a six-pak

Shipping is $7.99 Ground
and tax may be assigned if SmartHome has offices in your state.

So, for me, in California, it looks like it would cost $79.18 for a six pack of Scoop-Free Cartridges. (or $13.20 for each cartridge)

Compare this to Amazon at $95.94 for a six pack (free Shipping, generally free tax) (or $15.99 for each cartridge)
See:
http://www.amazon.com/ScoopFree-Fresh-S ... 10?ie=UTF8

or PetSmart
at $15.99 for each cartridge (plus tax - Free shipping over $75 until Sept. 3, 2006)
See:
http://www.petsmart.com/global/product_ ... p+free&N=2

Smarthome 25% off code: ERET04 - applies to entire purchase, expires July 31

I wonder if ERET03/02/01 do anything