I'm thinking of buying a decent khukuri to take with me on hiking/camping (hence not so big khukuri, maybe around 10-15 inches blade).
I don't know where can I buy authentic Nepali Khukuri in the US, and how much would I be spending?

Ebay or jackson height.

 I have 1. Let me know if you want. It is pretty cool. 

Now we know not to mess around with Lopchandai hehe....

ebay ma khoja na bro.. 40/50 ma ramro aucha

i was on the same boat a few months ago. I've plalyed with khukuris beautifully forged by the 'kaami' in our village back home; so these cheap knock-offs sold online couldn't persuade me. although there are some good ones you can buy online, they are wayy overpriced. so instead of a khukuri, this is what i carry when I go camping:

this is not me btw, the picture is one of the customer images from Amazon and the knife is called Timber Rattler Western Outlaw Bowie Knife. I'd recommend this or similar bowie knives, good quality and cheap as well.

There is a store in Berlekey WV, owned by Nepalese. Its listed for 65 on their website. 
http://www.himalayantrade.com/khukuri-knife-jungle-p-166.html