Remember the law of buying astro gear means the sun spots will vanish when you have your filter. And intense stormy weather too will show up.
The best thing about observing our nearest star is you can be pretty sure you're looking at the right object in the eyepiece. If you have a goto mount they default to NOT pointing or tracking the sun, its something you have to enable. Not sure where I bought my filter sheets from, possibly ozscopes, it was part of a bulk gear purchase I made. The normal reputable sellers should be fine to order it. You might want to check stock availability, the solar eclipse in Europe tomorrow would have created a demand for baader film. Good luck and happy viewing!