Chris Waller has added to his buying spree at a northern hemisphere sale that has been a proven source of winners for his premier stable.

Taking his spend so far to more than $1.5 million during the Tattersalls annual autumn horses in training sale, Waller purchased three horses on day three of the Newmarket auction.

He signed for an Intikhab two-year-old called Fracking, a Dansili three-year-old named Buchanan and Pythagorean, a winner of two races in 10 English starts.

So far he has bought nine horses with expectations of "ending up with 10 to 12".

Waller has an almost perfect strike-rate when it comes to Tattersalls purchases.

Before this year's sale, the Rosehill trainer had bought 44 horses from the auction with 41 of them winning races. The other three have yet to race in Australia.

As Waller prepares two graduates, Kelinni and Foreteller, for the Melbourne Cup, he revealed his latest UK purchases will more than likely be fully subscribed by the time next week's race is run.

"We will have them all sold within a week because we get a rough idea what we can sell first before we start to target horses," Waller said.

Waller said he was content to buy in volume at the lower end of the market because established stakes horses were now few and far between at the sale.

"They're just not letting good horses go any more ... they are pretty selective with what they are selling," Waller said.

"Plus we are competing with the Arab countries for their carnivals and Hong Kong is there as well as the people buying jumpers, so competition is fairly strong."