But to directly answer your original question, the Nextie NXT29XC24 is very close to the dimension you want, and costs a reasonable $155. Light-bicycle doesn't have anything that narrow anymore.
Coincidentally, if you don't mind a 3K/glossy finish, you can get a 24H version of the 29XC24 rim shipped immediately from stock at 15% off (so $130-ish + shipping) from Nextie's "leftovers" inventory here: Stock Products
Also note that you don't have to use such a narrow rim, the norm is wider. If you go wider you will have many more rim options, and most people run a wider tire in the front anyways.
In addition, typically rear wheels fail more often than fronts (higher loads and worse spoke angle), so if your front failed it may mean that the days of the rear are numbered. In other words, full wheelset.