Newcastle trainer Grant Marshall doesn't have a stable of million dollar yearlings but Slots was a cheap buy even for him.

Picked up at a Patinack Farm dispersal sale for $1800, the mare will chase first prize of $160,000 in Saturday's Provincial Championship Final at Randwick.

"She's my best horse and she's my cheapest," Marshall said.

Slots qualified for a start in the Final with a third behind Magic Of Dreams and Oxford Poet in a series heat at Newcastle.

But it was her previous run that underlined her credentials.

The five-year-old was Group Three placed in the Wenona Girl Quality won by Griante who subsequently finished third in the Group One William Reid Stakes in Melbourne.

It is a form line no other horse in Saturday's race can come close to boasting.

But Marshall is keeping his expectations in check.

"I'm never confident because I've known over the years working for big stables - I worked for the Inghams for 10 years - you get confident going into a race and you get deflated," Marshall said.

"But it would be good for her, good for me and it would be good to win it if I could."

Slots is a $15 chance for the $300,000 Final and will be ridden by Tye Angland who has been aboard at her past two starts.

She is proven in the wet and will meet the two horses that beat her at Newcastle 1.5kg better.

Just having a runner on the second day of The Championships is a thrill for Marshall, as he is sharing it with his son Ryan who is the mare's strapper.

And they won't be the only people at Randwick cheering for Slots.

"When she qualified at Newcastle, the owners had a 47-seater coach booked out in an hour," Marshall said.