Okay.  Fully wrapped and ready to ship, the remainder of my first batch weighs 4.52 pounds.  I checked the major package shippers' websites for quotes, using my own zip code and one chosen for California to get an idea how much it would cost to ship.  The cheapest quote that I could get was from UPS Ground for $17.62, but my prior statement about costs says that 4.5 pounds works out to be $14.40, so the actual cost of shipping is going to be the minimum and I'd certainly be taking a loss at anything under a $25 sale.  So it looks like I can't compete here with the cost of shipping, which is what I was afraid of.

If anyone is willing to pay 2.5 BTC for my remainder of a batch, just let me know.  Otherwise I'm just going to use it myself.