@trujilloto You locate the Savii in the gallery, then click the red 'x'; when the area turns red, it's been deleted. I believe there are still some problems with this symbol showing up, but am sure they'll be fixed soon.
You can either pay for bucks with actual US dollars, or attempt to obtain them through auctions by selling/bidding points or selling Saviis. Doing it via points is much easier.
Has anyone else been getting irregular spurts of Savii points? I thought it might be attributed to delayed distribution for reducing server load since some actions seem not to produce points immediately. But I can't say for sure when I can only vouch for a single account.