Bicycle Tutor

After putting a new tire on my rear wheel it no longer held air. I put soapy solution on tire to find air was escaping via the inside (it's not the rims) and exiting where the spokes connect. Any suggestions on places that repair wheels? I suspect my bike store will try to sell me a new wheel, which seems crazy.
Alternatively, any techniques out there to isolate where leak is on the inside of Tire/Rim?
Other note: Stan's is not sealing the leak.
Thanks!