Muay Thai Heavy Bas are available in all top online shops. There are also blog and post where one can get current information about the purchasing of the bag.
You can buy Muay Thai shorts from the leading Muay Thai Supplier Blitz Sport. Alternatively you can buy these shorts in the clearance from the Amazon website. You can compare the prices on price comparison website Kelkoo.
There are quite a lot of muay thai shops online. If you do a search in Google you can find numerous results. One that I like and always found very reliable is www.muaythaichampion.com they even have customized muay thai shorts. Check them out they have a fantastic collection
you can try to find out some really cheap sleeping bags online. Like searching ultralight sleeping bags, so you don't get those heavy and expensive one. Normally light sleeping bags is cheaper.
If you need paper bags for school lunches or goody bags, try the Dollar Store or Walmart. For something more heavy duty, try your local grocery store or an online wholesaler like RobertHam.com
You can buy bags and tool rolls on Steetz online shop
you can buy cheap bags at http://www.everytide.com/ with a reasonable price
One can buy OiOi diaper bags from multiple places. Some of these places where one can buy OiOi diaper bags include Amazon, Shoe Buy, Toys "R" Us, and Hayneedle.
of course
I bought a pair of Fairtex BGV-1's at http://www.warrior-one.com which is located in Seattle near the U district on 45th Street on the other side of I-5. They have a LOT of fairtex equipment as well as other muay thai equipment. Pretty much anything you'll ever need.
Dyson does not manufacture vacuums that use bags, therefor you would not be able to find a place that sells bags for these vacuums. For a vacuum that uses bags, you might check Best Buy or Walmart.
you can buy all sorts of different bags such as gola at Schuh
As of 2014 there are a few places where one can buy Kavu bags. These can be purchased at REI and Academy Sports and Outdoors.