When it first debuted, I remember the gamestop near me was selling it by itself for $399. I think that was 2003 or 2004. Something like that. I remember within about 9 months or so it was $100 and came with 3 games. A few months after that I remember them being like "Ok, $30, comes with 10 games. PLEASE just take these out of our store!!!"
I bought one.
Then I got home and found out you can get an MMC card (think SD card, before SD cards existed.....and also much thinner), and you could download ALL the N-Gage games for free. You could even store like 20 games on 1 MMC card at a time. So yes, I had 10 boxed games, but I never even opened them. I just downloaded them so I wouldn't have to remove the battery between game swaps.
Now they did also release an N-Gage XD, which is kind of like how Nintendo releases NEW DS after the original DS was slowing down sales. The N-Gage XD solved the issues of taco talkin, and needing to remove the battery. By this point it was already too late.