try some places where they keep horses.Around Oct 31st shops will sell it to you after they finish their decorations.I get it then and store it, but I don't know exactly where to get it around your area?

Reber Ranch in Kent or Del's Farm Supply in Auburn

If you can't find any at those places, there is always some at The Grange Feed Store in Issaquah.

Hey - great - thanks for all the suggestions.

You want straw, not hay. Hay has seeds in it.

Any farm/ranch/feed store would have it.

Hayes Feed & Country Store
908 Southwest 152nd Street, Burien, WA 98166

Island Farm Inc
417 2nd Avenue West, Seattle, WA 98119

Here is a link that might be useful: feed strore list

425+481-8882 Bothell Feed Thrasher's Corner (on Bothell-Everett Hwy, just north of I-405)
425+226-5239 Keppler Feed Renton-Issaquah Rd (Sunset Blvd) @164th SE
206+242-8000 Kirk Feed Downtown Burien
425+392-6469 The Grange Supply Downtown Issaquah
425+788-7610 Rocking E Feeds "Downtown" Duvall
425+432-0636 Iron Horse Hay & Feed Maple Valley, just n. of HWY#18 near Francis Lake
253+833-3550 Del's Farm Supply Downtown Auburn
253+630-3330 Reber Tack & Feed Just S of Kent-Kangley Rd, just W of Lk Meridian

IN QUANTITIES OF 10 OR MORE (will deliver to Seattle):
425+391-8393 Sammamish Valley Hay 21403 SE 43rd Way Issaquah
Horse Works in Ellensburg
(I know this not because of gardening but because I use them for erosion control on construction sites)