Thanks Meter 176
Join Date: May 2010
Location: Metro NY/NE Region
OP is from Argentina, South America according to XDA signature info - and, 4G LTE might not be as important unless s/he is using the N5 for global travel. According to GSM info table that I referenced (if it's updated) it's the usual & popular quadband and 3G data on UMTS 850 and UMTS 1900 (maybe 1800) - if this is accurate, the North America model should be fine - future network upgrade & 4G/LTE upgrade not withstanding.
For Las Vegas, the Fashion Mall on the the Las Vegas Blvd. a/k/a mid "Strip" has T-Mobile store/kiosk and should be stocked with it, but selling above Google Store prices - in addition to Best Buy, which is off the popular tourist "Strip" but with locations less than 5 miles away, an easy taxi ride away or easy to reach if OP has access to a rental car.
Or, if OP is staying in a LV hotel or a few days or longer, it might be possible to order from Google Store & have it shipped to the hotel and have them hold it if it arrived earlier than expected - or to forward it (or ship to a UPS retail location in LV for pickup)
Google Nexus 5 - 4.4.2 !! *rooted* stock - x 2 in black & white: T-Mo 4G
Asus 2012 Nexus 7 32GB WiFi, 4.4.2 *rooted* stock
HTC Incredible 2 x 2, unlocked S-OFF CWM 5.x HB.97 (6.13.1002) SR's Zeus R1.3, Sense v5.0.m-e4: AT&T/T-Mo
Viewsonic Vpad7-CWM 5.x EUv1.7b ITE Rom 2.2.2 hw107, A2SD, 3G+WiFi
HTC Droid Eris-GB 2.3.5 CM7 V.24RIP-Vanila-ICS, WiFi only (2.42.02.10.29)
HTC Ozone (unlocked GSM+CDMA) 3VO ROM: WinMo 6.5: CMHK/CN+
Sony E. W995 CID53Red, R1HA036 generic, C905 custpack