I know until recently the only places I saw Washi tape were in online scrapbooking stores. Then Tim Holtz had a line, but called it "Tissue Tape". Now, it's come more mainstream and you can find the Michael's "Recollections" brand "Craft Tape".
Here's a few of the rolls I picked up this week (they're regularly for $4.99 but 50% off this week so only $2.49 for the package). I photographed the back so you can see the UPC in case you're interested in calling your local store to check stock. The last pic shows the front so you know what the packaging looks like. I found mine on a special display near the front of the store (up by Martha's stuff).
