No one else is building them, your best bet is to cruise Gunbroker. Unforutnatly, this probaly falls under the 'you snooze, you lose' pricing- prices will be up on Vector Uzis right now, which are the cheapest around.
You might be able to score a Norinco Uzi for a reasonable price, but I reocmmend reading up on the uzitalk frotn page before jumping in on one of those.
Even if they do they have to obtain Bolts. And Vector was all out of them and waiting on them to be made when they decided to sell out. So that is still an unknown as to when and if those would be obtained. If not, no Uzi.