I buy things on eBay from time to time. I rarely sell. One exception was several years ago, I bought 5 Universal MX-980 remotes + chargers for $202. I only wanted 3, so I sold 2 of them for $82 and $90. One sale had fees, and the other was by messaging, so my net cost per remote I kept a little over $10. Several years ago, the remotes used to sell new for ~$400 and have listed for over $500 at times, so this is probably my best deal. I really enjoy these remotes. They can be programmed to do things like press one button to turn on all theater equipment with time delays while waiting to power up, and set lighting to desired levels. They also have a set of buttons at the top that can be set to whatever functions are useful/frequent for you. I have 4 – one for each of the 3 TV viewing locations and a 4th as a backup. The design isn’t ideal today with streaming not using 0-9 buttons, but all remotes are still working, and I enjoy using them every day.
While I really enjoy the remotes, the most fun deals for me are my home automation purchases. I’ve purchased a lot of used home automation equipment for >90% below original retail price on eBay. There is one particular component for which I’ve bought the majority that were sold on eBay in within the past 5 years. It sells for a low price because I am updating an older and largely obsolete Lutron RadioRA system that wasn’t designed to work with LEDs, smartphones, Amazon Alexa, motion sensors, etc. However, I’ve found ways to do all of these things with the old system, if I have the right components. Updating, rewiring, and reprogramming my system and seeing the rewards makes it the most fun purchases for me.
Another fun type purchase was a SNES Mini video gaming system, which I’ve gotten to work with games from most well known video game systems prior to the year ~2000 including Atari, NES, SNES/SFAM, N64, GBA, NDS, PS1, Genesis, Saturn, Dreamcast, TGF, and NGO. However, I’ve only especially enjoyed playing a minuscule fraction of the available games. I think I enjoy getting it to work with games from different gaming systems more than actually playing the games.
Seconds before opening this thread I bought a sealed Embark DNA test for my dog for $69, including cost of shipping. The retail price is $109. I previously purchased and did a Wisdom test during Black Friday. I am also doing Embark since it tests for some different breeds (particularly interested in Mountain Cur), has a different algorithm that is generally considered more reliable than Wisdom, has a different relatives database, provides better genetic detail, and provides some additional information, such as coefficient of inbreeding. I find this type of genetic analysis fun as well.