JBJ45 Return Pump Replacement

[McGene]

I have been using the stock return pumps (2) on my JBJ45. I know many immediately replace the two pumps with one from the start. I elected to use what came with the system until something failed. One of the stock pumps just failed and I would appreciate a cost-effective replacement recommendation.
I would prefer to use one pump in place of the two.
Thanks for your help.
-gene