Yes, postage did go up for items over 1 ounce... by about $.02-.03 per ounce. But it's only $2.88 for a whopping 11ounces & thicker than 1/4" thick... this can't weigh more than 2 ounces, even metal. I've had big, thick pewter pieces that are 5 inches long weigh less than 2 ounces. And it's so thin, it 'might' be thicker than 1/4" if you pad it a lot... but even then, it shouldn't be more than 2-3 ounces, which is less than half your ship cost. Sorry, this just seems high for the item & actual postage cost.
It's made out of some kind of medal which makes it really heavy and I knew the post office would charge me extra for that, plus I just got an update from the USPS that postage would be going up.