Yes you can get a 3/4 in the KitchenArt sliding ‘adjust-a-spoon’ measuring spoons… I LOVE mine! In just one spoon I get 1/4, 1/2 3/4 and 1 teaspoon and the best thing it’s SO easy to wash up just one spoon! We’ve had them here in Australia for quite a while and they are becoming more popular, the pourfects previously mentioned look great too.
You can get them online at: http://www.kitchenart.com
Just checked the US site and there are lots of new measuring spoon and scoop products in both plastic and metal - actually I just spied the new ‘measure-max’ may have to get one myself (assuming they make one in Australian measurements - sigh why can’t we all have the same idea of what a tablespoon is!!!)