That Weller WLC-100 model is not even a true Weller, that model is sold with many brand names.

After using a Weller WECP20 for about 30 years and having some issues lately I bought my self a new Weller WE1010 about an half year ago. This is like a late follow up model of the WECP20 but now with a 70W iron instead of a 50W. The tips are very cheap, easy to get and I did read do also fit the older WECP20, I directly bought some tips with it from small to the biggest and works awesome. I love the standby function when not using it for a certain time, it does save tips..