Theknot.com has developed a list of localized websites with lists of local wedding vendors and sources. You can find these lists by going to http://www.theknot.com and clicking on the local resources...
Party shops that cater to baby, wedding showers often carry garters and other things one may need at the wedding. Also wedding dress shops would carry garters, but would probably be more expensive....
There are wedding ceremonies available on the internet for free, as people very much enjoy posting their ceremonies.
The Ultimate Wedding & Ceremony Workbook for the 'Planning-Impaired' is a...