Edit, just realized he wants an omega, so obviously a 24 model and yes there are many on the lot.
Yes, don't worry about what year the vehicle is, get the best deal. Also if your leasing you may want to move soon as two factors could change for much worse. First, Hummers still have ridiculous residual values from when used units were selling for as much as new and 2nd the $7500 ev credit may get chopped by the new administration. As soon as that's announced there will be a rush to buy EV's before it expires which will raise prices temporarily.
I would have waited longer if it wasn't for those two factors. Especially the inflated residual values. We all know used prices are dropping fast which means its only a matter of time for residual values to get updated.