The sponsors of last year’s Eisteddfod are mentioned here but there is also a complete list with links in the email each week.
Basically I look for small Welsh businesses that have an online presence so that SSiWers can order from them if they wish. Then I explain about the Eisteddfod, the number of learners we have worldwide, and ask if they would like to donate a prize in return for their business being promoted on the forum and in the weekly email. Some don’t respond at all, but a reasonable number are happy to take part. I have sample letters and complete lists of all those I approached last year as a starting point.