Hi, Mark,Inexpensive rim-brake rims are hard to find. If you don't get any response from the group, you may consider the infamous Weinmann Zac19 rims. You can find them fairly inexpensively online. They are strong, if not slightly hefty (though not nearly as hefty as Keba or Cliffhangers, but certainly heavier than A23 and Pacentis). The ones I work with (and I built 2 sets of them in the past year) require fiddling with soup/talc powder and thick rim tapes to get the tires on evenly.
Has A23's for $50/ea. They used to have 32h and 36h, might be down to just 36h now. They're good rims, my only complaint has been that the brake track is a bit narrow.
Paul