Honestly check Facebook Marketplace or Kijiji for the Legends Pro - I've seen them as low as $150 on there before. The Brick takes pretty heavy discounts on them occasionally too.
Arcade1Ups have become a bit of an addiction since I started this thread and I'm up to 9 now
TMNT
NBA Jam
Outrun
Star Wars Pinball
Buck Hunter
Marvel vs Capcom (Original)
Golden Tee
The Simpsons
Street Fighter II Yoga Flame
I've been able to get them all on sale, or with heavy discounts second hand, and it's honestly become a bit of an addiction to try to find them for cheap or a discount.
I'm pretty much out of space now though (which is a good thing), with just one last spot reserved for NFL Blitz once it goes on sale at a discount or second hand ($800 is way too much).