Need to find the right chess clock

I am playing a chess tournament next Saturday in this time control 40,d5 and I am having trouble finding the right chess clock I need something that you can make a custom time control.  I need something inexpensive.  Any suggestions

CM Mecanicas is a app clock acceptable in uscf tournaments?

It's very rare in the US for tournament organizers at the amateur level to provide equipment, Mecanicas. 

Ashton, I have a DGT North American that costs about $35 and can be programmed for any time controls used in USCF events. But I wouldn't stress about having your own clock. Just about anyone you'll play will have one, or if not the tournament director will find a spare from a game where both players have one.

Best of luck in the tournament!

thanks for the suggestions everybody