There has only been one showcase in January with a price ending in 00. On the other hand, there have been showcases ending in both 999 and 998.
Spoiler Alert:
Wednesday's episode will have a Double Showcase Winner. That's because it's a repeat - the best guess is, they taped an episode with a Grammys showcase that they were going to air on Monday ("The Grammys, tonight on CBS!") before the Grammys were moved to April 3, so they moved the Tuesday and Wednesday episodes to one day earlier for whatever reason; presumably, the Grammys episode will air either Thursday 3/31 or Friday 4/1 (with an edit to change "tonight on CBS" to "this Sunday on CBS"), depending on whether or not they want a dedicated April Fools Day episode on 4/1.