Many items are up for auction on eBay go unsold due to being unbid. If you can find auctions about to end that have no bids, you may get a great deal.
eBay’s search does not provide this capability but several 3rd party search sites do. NoBids.net seems to show the best results. Beyond patience, experimentation and using the “-” excludes certain keywords will narrow the search. Since this only works in real-time, you either have to come back frequently or just rely on luck.
Example search
“ipad” between $50 and $100 returns a lot of accessories like stands and cases. Using the search “ipad 16gb -screen -case -stand” narrows the results to a few items.
Example alternative is 0bids.com.