Deutsche Demokratische Republik

Any value in complete books of these stamps?

There are several varieties of these, and the prices can vary wildly.

If they're the most common variety, they would typically sell for $5-$10 per booklet, assuming they're complete and in good condition.

I note in the background, the "THOR" Stamp Press.

PostmasterGS is correct. The value for these booklets are all over the board. Differences in watermark position (vertical or horizontal), perforation (extending into the selvedge or not) and even what advertising is in the booklet interleaving can make a huge difference in value.
From the limited information in your picture, the booklet appears to be a MH3 H-Bl.-MiNr.7A, one of the most common type of booklets.
It can get complicated very quickly.

Dan