The .44Spl is a regular production chambering for USFA. These are the best of the best. They are a better-made gun than Colt but cost less. Precision made on CNC machinery and final fit and finish rivals that of the best of the early guns.
Colt's are available by special order. Colt's are much better than previous 3rd generation iterations but they're still overpriced.
Uberti's are available in .44Spl through Cimarron, Dixie Gun Works and Taylor's. Very good guns for the money, under $500 with quite authentic. No funky transfer bar.
Ruger has New Vaquero's in .44Spl now as well. Great guns and tough but if you want a traditional action, no New Model Ruger will suffice.