Thanks Jim.
Bathtub curtains, white trash bags, white nylon fabrics, acrylic lighting panels and stretched artist canvas...work well too. The photo supply places love to mark up the diffusion materials. One can go to a fabric shop and get them very reasonably. Then build a frame from PVC irrigation pipes and fittings. Add in a single speedlite and a remote trigger for ~$100.
This time of year getting a rig to photograph their own pieces is easier on the wallet.
I use these triggers: (The camera has to have a hot shoe and manual capability.)
https://www.bhphotovideo.com/c/produ...emote_for.html
Lightstands:
https://www.amazon.com/Neewer-Photog...i+light+stands
Youngnuo flashes:
https://www.bhphotovideo.com/c/searc...yongnuo+flash&
I would suggest an older model flash from the big players relative to your rig : Nikon, Canon, etc. Third party units like Yongnuo, Godox, Flashpoint, Orlit, etc are budget minded pieces that have nice features. Not sure on the reliability. I have a Canon 580EX circa 2006 that has been great, that's in the travel kit.
This Jim Sornberger flipper was shot with two-speedlites: Main above and then the second for shadow fill. Same as the Mel Nishiuchi higher in the thread.