here are a few ideas, they're all variations on a theme but vary greatly in their difficulty.
Dumbbell squat press - curl 2 db's up to your shoulders, keep them there, squat down deeply, squat back up with the db's still at your shoulder. When you are about 3/4 way back up, Arnold press the db's above your head.
It takes a bit of practise to find the rhythm, use light weights to start.
Overhead squat, dumbbell or barbell, or better still use a kettlebell - grab a light kettlebell, I use 12k, press above your head. Squat down with the KB still pressed above your head, squat back up, again with KB still locked overhead.
Sot press - grab a kb, even lighter than the 12k above, squat down and then press from the full squat position. Stay squatting, keep pressing. You could also try this with a couple of dumbbells, this is seriously difficult. You're looking at using 8k db's max. Stay in the squat position and press both dumbbells. Enjoy.