Several volunteer and membership organizations are working with industry suppliers or conversely it may be the industry suppliers who want to associate with the organization to provide a way for purchasers to round off their order either online or at a point of sale. The NRA Round Up is probabaly the largest I'm aware of and is used by shooting retailers Midway USA & Brownells. Cabela's does an add a buck for the NRA as well.
If everytime someone bought something at a scout shop, tooth of time, or at scoutstuff.org, probably other applications as well. We should offer them the chance to "change the future" by simpling rounding up their total after tax, shipping, etc. That change could add up quickly.
Here is a link showing how the NRA has gained over $4.2MM from donations via Midway USA and over $6MM total since 1992.
http://www.midwayusa.com/nrapage.dll/gettotal?utm_source=nrasupport&utm_medium=homepage112808