Seattle's Environmental Home Center is a nearly comprehensive resource for green building, renovation, and living.
Their retail space is in the Industrial District, but many of their products are available through an online store that also includes penty of educational materials. Company founder and Green Living autodidact Matthew Freeman-Gleason shares the fruits of his research on the site, so you can learn how to go green on a budget or make sure you're up to the task of installing cork tile floors yourself before you make your purchasing decisions. (The marketing of green living can be bewildering and even misleading, so we appreciate an effort like this on the part of a retailer who is dealing directly with the public.)
For the renovator, the EHC carries building materials like Europly and MDF, home energy systems including energy-efficient insulation, Fair Trade Federation bath fixtures, natural carpets and cork tiles, cabinets & countertops, non-toxic paints, finishes and wall coverings. There's even a referral service for green builders, contractors, and architects.
If your green home makeover is a little more modest, say, limited to purifying your environment as much as possible, you will still find plenty of ways to part with that other kind of green: there are people-friendly cleaning supplies, bath accessories, water and air filters, composting supplies, FSC-certified garden furniture and a selection of bamboo and copper housewares.