Sell up

[…] he was never known to give away a shilling or to do a good action, but was of a pleasant, sly, laughing mood, and would cut his joke and drink his glass with a tenant and sell him up the next day […]

Attracting consumers with a low-priced feature item and then pointing out weaknesses in order to sell up to a more expensive […]

He was not going to have salesman ^([sic]) sell up to a more expensive and more profitable car that was no better than his Ford.