And here I felt bad for dropping $70 on the digital collector's edition. But seriously, it's your money, so spend it how you like. You should be able to get ME1 for about $10 if you go used, though. (ME2 not so much, what with the Cerberus Network code and all.)

Mass Effect 3 Collector's Edition is already sold out on Amazon, GameStop.com and pretty much every GameStop location, so you'd better get on that if you want to. I'd say what with the bonus squad member (plus all the other lesser bonuses) it's definitely worth it if you can find a copy.

Don't feel bad, I've spent more on things that don't retain value very well.