Some decent buys lately:

-Got the two Saturn games on Ebay for around $25 each, well under the normal selling price. Both are complete and near mint. Still some deals to be found on Ebay every once in a while. The Rayman was listed without a picture (only a stock photo), but was described as very good condition with case & manual so I took a chance. I almost never buy without seeing an actual photo, but I figured Ebay would get me my money back if it wasn't in the described condition.
-Paid top dollar for Gradius V (which I rarely do), but it's absolutely mint condition, and I've been wanting to play it for a long time.
-Super Mario All Stars & Shinobi 3 from Gamestop - $27 for the two. The label on Shinobi is a little damaged, but the Mario label is really clean. I have a manual for Mario, so I printed an insert from here and now I have a really nice addition to my collection.
I also just missed getting a Sega Nomad for less than $30. I frequently look at "newly listed" Sega items, and the first item on a recent list was a Nomad that the seller said he couldn't test. Since Nomads require a separate battery pack or an AC adapter, it was very likely that this unit was in working condition and the seller just didn't know what he needed to test it. It was the first listing of nearly 100,000 Sega items (meaning it was just listed minutes ago), but it was already sold by the time I clicked on it.