This comes with two magazines, one 25 round magazine and one 20 round magazine. Hope this helps.

Benito, # OF MAGAZINES: (2) - MAG DESCRIPTION: (1)20 rd. & (1)25 rd. 32 rd magazines here : robertrtg.com/store/pc/UZI-32RD-MAGAZINE-IMI-ISRAEL-163p2921.htm

32 round magazines available here
gunshowmags.com/uzi-25-round-9mm-magazine/
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Or you can hit the notify me when available button to receive an email when they come back in stock at buds
budsgunshop.com/search.php?q=Uzi+magazine+&type=

2 Mags 1 20 and 1 25 see *******MANUFACTURER: IWI - Israel Weapon Industries
FAMILY: UZI Series
MODEL: UZI Pro Pistol
TYPE: Semi-Auto Pistol
ACTION: Semi-Auto
CALIBER/GAUGE: 9mm
FINISH: Black
FINISH TYPE: Black
STOCK/GRIPS: Polymer
BARREL: 4.5"
OVERALL LENGTH: 9.5"
RATE-OF-TWIST: 1-in-10
CAPACITY: 25+1
*******# OF MAGAZINES: 2
******MAG DESCRIPTION: (1)20 rd. & (1)25 rd.
SIGHTS: Adjustable Target Sights
SIGHT TYPE: Adjustable Sights
SPECIAL: Threaded Barrel Model
WEIGHT: 3.66 lbs.
SAFETY FEATURES: Manual Safety & Grip Safety
ADDL INFO: Picatinny Rails
*******ADDL INFO: Includes both a 20 & 25 rd mag
ADDL INFO: Grip Safety
MFG MODEL NO: UPP9SB-T
UPC: 818004022757

magazines, one 20 round and one 25 round in states that permit these magazine capacities. A 32 round magazine is also available where permitted by local law.
Full specs on IWIs website
https://iwi.us/product/upp9t/