Parallels 8 is available for $20, so Apple's freebie offsets the $20 you will have to spend to use an old Samsung printer if you don't already have Parallels.
Until then, just remember that Mavericks was free and that most OS X upgrades are $20-30 depending on when they are purchased. It stinks that the ML-2010 printer is not natively supported in Mavericks right now, but maybe someday Samsung will release a new driver. Parallels Desktop 9 works on Mavericks and I was able to print from it after installing the 'universal Samsung driver' on my virtual Windows XP machine from their support page for the Samsung ML-2010 printer. I remembered that I had Parallels Desktop on my mac, which can use Windows compatible peripherals. So I thought I was stuck and that my Samsung ML-2010 printer was now incompatible since I had upgraded to Mavericks.