I have two methods of making money in Pokemon Black & White. The first involving the Pokemon Stantler (or a DW Furret. Look it up.) Stantler has the ability Frisk, and can learn the move Theif.
Yeup, you see where I'm going with this. I go to Route 13 and run up and down the beach, waiting for a surfing spot, into which I surf into. The Pokemon enounterable are Staryu (60%) Corsola (30%) and Starmie (10%). Staryu and Starmie both can be holding Stardust (50%) Star Piece (5%) and Comet Shard (1%) (Haven't found one yet xP). These can be sold to the items collector dude in Icirrus.
My other method is finding the newly introduced EV Wings. Marvelous Bridge and Driftveil Drawbridge have shadow spots that, when walked into, supply a Ducklett, Swana, or a Wing. These wings sell for around 1500 each (except for the Pretty Wing, which is odd, since its listed as a "valuable item", but only sells for 150 PokeDollars). Theyre VERY easy to come by AND you can get some HP EV training and Speed EV training done fighting Ducklett and Swana respectively.
Enjoy.
I like the idea of the Savings Bond. Its a great idea, and even thought I doubt GameFreak will include it, I'm in support of it. I don't see anything wrong with it. LOL what would happen if you Flung (used Fling) it? xDD
BTW Sorry for being completely off topic about it but I just had to get those methods off my chest. Teehee, I've got about $600,00.
~DT