Vespa doesn’t make a 125cc scooter they have 50 and 150+ Yes they are quite expensive.
Good news is if you buy a reliable brand, you can buy used!
If you like the “vespa” style, I would suggest a Yamaha Vino 125. They are fantastic and very reliable.
The only scooter company in the US that sell reliable scooters that size are:
Yamaha Zuma 125
Yamaha Vino 125 (vespa style)