If the cost is still too high, I would recommend calling. I'm sure they can work something out.
Here are some of the benefits according to the Spay USA organization:
http://www.spayusa.org/main_directory/02-facts_and_education/benefits_sn.asp1)
The Las Vegas Valley Humane Society (LVVHS) offers low cost spay and neuter clinics for cats and referrals for dogs.
All appointments are made through the LVVHS directly. Call[masked] or email us at [address removed].
http://www.lvvhumane.org/snip_clinics.php2)
W. Charleston Animal Hospital at[masked]
3)
Heaven can wait charges 115
http://www.hcws.org/services_and_fees.html4)
Also give leid a call. They may do it as well.
5)
NEVADA
The Animal Foundation
Spay/Neuter Clinic
700 North Mojave Road
Las Vegas, NV 89101
[masked]
6)
There is a low cost spay/neuter clinic.
http://www.spayneuterlv.com/