You can purchase dakimakura in Japan both online and in physical stores. There are a number of stores that specialize in selling dakimakura, such as Tora no Ana, Animate, and Gamers. You can also find these items on websites like Amazon Japan and Rakuten. However, you may want to shop around and compare prices as some stores may have better deals than others.

As for looking like a "weeb," there is no need to worry as dakimakura are quite popular in Japan and there is no shame in buying one. It is a popular item and there are many people who collect them. You should not be embarrassed if someone looks at you in a slightly contemptuous way, as this is likely because they are jealous of your collection.