Spencer's is a good store to find gag gifts.
Urban Outfitters
During the Christmas season gag gifts are plentiful. These can be purchased at novelty shops and gag gift stores. Some of these stores are The Prank Store and The Goofy Gift Shop.
I've actually seen this sold in an aerosol spray can at a store called Spencer's. You can usually find them in malls (at least here in the south, you can.) You could probably find it at a store that sells gag gifts, too.
Yes. retirementgiftshop.com is a website that sells retirement gifts for men and women alike. http://www.retirementgiftshop.com/
There is a list of gag gifts on word press - the link to which can be found in related links.
Company Store Kids sells many supplies for children. It sells items such as children's bedding, furniture, clothing, luggage, toys, and gifts.
Gag gifts are suppose to elicit laughter from the recipient as well as from the people around at the time of gifting. They usually fall under the novelty gift category, and have a funny aspect to them.
Memorablegifts.com is a great site to find gifts for family members, loved ones, teachers, etc. You can even personalize your gifts for that special person in your life!
You can find great anniversary gifts online store at redenvelope.com I have come across some unique gifts perfect for every occasion. If you are looking at a physical store, you can go to Macy's They have great collection of perfumes, gift sets, purses.
Lumps of coal can be purchased at science shops, such as the ones where you would buy science kits for children. Also, if you have a year-round Christmas store, they often have lumps of coal as gag gifts.
Spencer's sell a variety of products such as clothing, swimwear, baby clothing, body jewelry, bags, footwear, posters, lamps, party & drinking stuff, toys and many other fun stuff and home accessories.
A good wedding gift for your brother could be fine china as well as other pieces of home decor. For example, a shop such as Crate & Barrel sells suitable gifts like champagne glasses or decanters.