I have a great Sega CDX system (Sega Genesis/Sega CD portable game system combo) that works great, and comes with 2 controllers (one 6-button, one 3-button), as well as AC adapter (official model 4122 specifically for the CDX), and A/V cable.
Here's a pic of actual items you will get:
http://img408.imageshack.us/img408/9497/segacdx.jpg
PRICE: $140 shipped within the USA
No trades, price is non negotiable.
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I also have a Sega Genesis 2 system with 2 controllers, AC adaptor, AV cable, RF cable, and Vectorman game (cartridge only). Picture of actual items here:
http://img408.imageshack.us/img408/1693/genesis.jpg
PRICE: $60 shipped within the USA
No trades, price is non negotiable