A couple weeks ago, I ordered a beginner ukulele - a Makala MK-S. It being my first uke, I decided I'd buy one of the cheapest instruments on the market (under $50), play around a bit to see if I was interested, and then pass it on to my two-year old son and upgrade.
I'm fairly pleased with the Makala - for the price, it's not a bad little ukulele. But, as is common with instruments this cheap, the intonation is horrible, making certain chords sound horribly out of tune. To fix the issue, I followed the advice offered in this YouTube video - taking a piece of bone (a fragment of a saddle in my case) and using it to slightly change the length of several strings, which fixed the intonation. It may not be pretty, but it's a cheap fix for a cheap instrument.