Are handscrews a thing anymore?

Harbor Freight has them, I have a couple and they are decent at reasonable prices.

I made a dozen and a half 40 years ago.  Got some 5/8 mild iron rod for the barrel bolts and 5/16 for the screws.  A cheap set of right and left hand taps and dies and it was a good project.  It is very satisfying to create something that is and will be useful for a long time.  I still use the hand screws often.

I've got 4, 2-6", 2-12".

I have a wall full of them.  4" all the way to `16".  Use them all the time in one way or another.  They were all purchased used.  Never bought a new one.  I had a bunch of the old wood screw ones, but got rid of them as I accumulated the newer steel screw type.
  Ron

Just used a couple the other day. Had to cut a small piece of steel. Clamped the steel in one, used the other to fasten the clamp to a saw horse outside the shop. I have some from Grizzly, some Jorgensen. Surprisingly I found a bunch of 6", 10" and 12" at Big lots years ago, Chinese, but good quality.

Wish I could use them. I'm just too uncoordinated.

A few of them around the shop are very useful.  They are very powerful due to the insane leverage.  The ends are precise, and grip well on wood particularly weird angles.

They are also very useful if used as vises on workbenches, if one does not have the genuine article.

I have a nice collection that I bought in a yard sale. My grandson and I use them to stabilize the ends of wooden boxes while attaching the sides.