This is the situation I find myself in. Plastic Jungle is providing just such an opportunity: a $100 Costco gift card for $98.
I think it's totally worth it! This is almost indistinguishable from finding two dollars on the ground -- or more accurately, your significant other tells you about how she found two dollars on the ground and deposited them into your bank account so that you didn't actually see the dollars but you know they're there.
The cost is that I'll have to punch my credit card info into a website, open up a letter in a few days, and remember to take the gift card when I go to Costco some time in April. That's virtually zero cost. But right now both my girlfriend and my office mate are standing by the argument that, essentially, two dollars is not a big enough deal to make it worth while.
Every time I hear an argument that "X dollars is not that much" I recount MMM's post about how $10 is, in fact, a lot of money. I don't see why this same concept shouldn't be applied to smaller dollar amounts. If I can get $100 of goods for $98 dollars, and (crucially) if that doesn't cause me to increase my consumption, then I should go for it.
I can't justify leaving $2 on the table. It feels like the same argument as "a trip to work only costs like $4 in gas and maintenance, so why bike?". So I think I'm going to get the gift card.
What do you guys think?