You look like an understanding fella.  You know how it is.  Sometimes you just can't get all the dough.  Next month for sure.

Oh gee, I must have left my wallet at home.  Well I have a little money with me, I'll bring the rest next month.  Trust me.

I really am quite sorry about this, but I just can't seem to raise all the necessary funds.  I'll be back next month for the rest.  You can depend on it.

I fear that I cannot take it all this month.

Have no fear.  Next month I will be able to take complete delivery.  But this month I cannot.

Due to bad weather, my funds have not arrived from Tunzankipital.  I will pay what I can.  Please hold the rest.

Will you please hold some of it till next month.

I am afraid I can't accept a complete shipment this month.