Auctioneers love tongue twisters, they help us to improve our auction chants. Here are a few you might want to practice before you get to an auction school you pay for.
Here is a great documentary from 1976 about auctions. It has a lot of great tongue twisters in it as well as a lot of great information about auction chants.
Here is a video of a class at World Wide Auction College of Auctioneering going over the Betty Botter drill with some numbers thrown in.