Remember time is money and they need to see the need to hurry, heck if they take your offer you could "sweeten" it when negotiating start and end times by offering a "bonus" for early completion. 

But what I really liked about this deal was how you stuck to your buying discipline and went for it only when the numbers would work, and then putting in a low offer to sweeten it further in your favour!

You can sweeten deals with individuals who don't seek to make mortgage loans.

That might sweeten the deal with the potential of a quick close.  

Having sweeteners available such as personal property: cars, boats, Karatbars or silver bars can sometimes be the final perk you can throw into a deal to lock it down.

If circumstances exist you can partner with the owner and many are receptive if you sweeten the deal for them at the end.  

Almost any asset can be pledged, unless restricted by law as your retirement accounts are.If you have accounts receivables or contracts from you operations your bank may factor those, basically an advance or loan on such accounts.Cross collateralization my be employed, you can give a seller a second on another property to sweeten the deal on a seller financed transaction.Then obviously, you need to slow or stop your contributions to the retirement accounts.

I told him if he was out sooner I would sweeten the pot .

Get the deal under 100k and sweeten the pot for the buyer.Everyday I'm trying to create more value in real estate and relationships.Frank

Moved all of my deposit accounts to them to sweeten the relationship.