Check the Vendor section of the Marketplace. You should be able to find both fish from one of the suppliers. Try Gage of Cichlid Connection. I believe that there is a member selling juvenile Dovii in the Marketplace too.
I know Cakilla is selling some Umbee... he has about 40 or so for sale soon, if not now. He is near St. Louis, I think Illinios?? His Umbee pair came from Freshwaterpredators, who has some top notch Umbee. Give him a PM.
If not him I have both umbee and dovii (Rio Heridia)fry from 1/2-1" available and I can ship them priority. I also have a few larger umbees too 1.5-3.5" but just a few of that size. My umbee male is in my avatar and dovii male is the kraken. But yes cichlid connection and CAKILLA are a good source as well
You can try openwaterpredators, a member on here. He is in Cincy....has both costa rican varients and also had Nics at one point althought I'm not sure if he still has a breeding pair of Nics. It will save you shipping cost. That is where mine came from in my avatar.
Go to the adavanced search on the left of the page. Then search by user name and private message him. Jeff Rapps stock have came from him in the past....not sure about curreent stock but like I said before you won't pay for shipping and can get a much better price.