Are there ANY scanners out there that are compatible with Maverick?

Try this: Microtek Driver

Yes, pretty much any scanner listed on this article:

http://support.apple.com/kb/HT3669

Apple support downloads for vendor specific drivers exist for HP, Ricoh, Canon, Epson, Brother, Lexmark, Samsung, Fuji/Xerox

Open source support from:

http://www.ellert.se/twain-sane/ together with http://www.sane-project.org/sane-mfgs.html

Additional ones from

http://www.exactscan.com/download/compatiblescanner.html

Some HP ones have a trick you can do as documented by this thread:

http://discussions.apple.com/thread.jspa?messageID=5786673#5786673

http://www.hamrick.com/ Vuescan has support for these scanners:

http://www.hamrick.com/vuescan/supported-scanners.html

Image Capture support http://macmanus.nl/2013/11/28/use-unsupported-scanner-in-mavericks/

http://www.silverfast.com/show/mavericks/en.html has Mavericks support for numerous scanners.

scribejm wrote:

after reading through various posts I have yet to find anyone with a scanner that works with 10.9.3

In fairness, people aren't likely to post threads saying that their scanner works.

FWIW, my Epson Perfection 4990 works like a dream in Mavericks.

As a fairly veteran and experienced Photoshop user, when scanning, it is really best to get the best scan possible, initially, than using Photoshop, afterwards, to try fix any issues from not having enough control of over the initial scan.

If you want/desire more control of your initial scanned images, look at VueScan and check to see if it is compatible with your Microtek scanner model.

http://www.hamrick.com/

I have been using this software for over a decade and it is very comprehensive and works very well on both low end and higher end scanners.

It is well worth the asking price.