As we were wandering in the palace trying to find the WC, we saw a sign that said something close to souvenirs so we followed it and found a lady selling plaster cast plates with Roman or Greek gods (sorry, don't know which are which) and other plaster cast souvenirs for next to nothing.
We bought a few to bring back (they weigh almost nothing) and they made it back unbroken.
The lady in the booth seemed so glad to see us, maybe she doesn't get too many visitors? In any event, take a look as long as you are in the palace.
It is a small shop near the box-office
What to buy: While you’re buying tickets you can see many souvenirs, postcards and other beautiful things.
What to pay: Ticket to the Palace costs 1, 70 LVL. Souvenirs started from 1,50 LVL.