I just wanted to emphasize what others have said about comparing diver training and that is to compare apples to apples. You live in the PNW -- you are fortunate to have have tons of options.
Costs: Check lots of shops. Ask about what the cost and what it does not. Ask if they have any sales coming up. Is there a fee for the C-Card? Is there a charge for a crew pack (or similar)? Is there a charge for a DVD? What gear must you provide? Do you have to purchase it there? Are there are any charges/rentals for the cert dives?
Training: Please see the earlier mentioned thread on choosing a class. Generally speaking, I would second that thread. Less obvious things to consider include where the class meets, the pool, do you have the option of extra pool time, quality of their rental gear, etc. IMHO, the longer the classes (and especially pool time, they better you are). I think a better training experience is worth the (often small) extra cost.
Extra Values: Do they offer any free post-cert rentals? Gear discounts? Rental discounts? Free shop dives?
Gear: Most shops (perhaps all around here) require you to provide some gear.
If they do, any decent shop will insist that it be of sufficient quality and that it fits. You don't want to use gear that fits poorly or that is falling apart (or is designed for light pool use). You want gear that is appropriate for local diving (around here, that means beefy boots, open heeled fins, etc.)
The local list seems to typically be: mask, fin, snorkel, booties and gloves(!). Other places I know of (outside the area) also require weights (?) and mouthpieces. Another provides everything but the swimsuit (also out of the area). Some require you to buy it from them. Others do not.
An Example: Not an endorsement of a training provider but here is one example. Underwater sports lists training at $110. The crew pack is $52. The cheapest mask/fins/snorkel and booties/gloves package is $135 and $60. Would they be OK if you showed up with well fitting, good quality used gear? You would have to ask.
Some Shops: In the south end, I am a fan of Capital Divers (Olympia) and Tacoma Scuba (Tacoma) as well as A2Z (?) in Puyallup. All three shops are well run. I also think Janet at Underwater in Olympia does a very nice job. I find Lighthouse to be more hit and miss. Just my opinion and YMMV. TS&M probably knows the north end shops much better than I ever will...